A. The maximum height above the ground of a projectile launched at an angle of 29.2° to the horizontal is found to be 57.5 m. What is the initial speed of the projectile? b. What is the horizontal range of a projectile launched with a speed of 39.6 m/s at an angle of 28.2° above the horizontal?

c. A bicyclist is currently traveling south at 10 km/h and is located 17.3 km south of the center of the nearest town. She begins accelerating north at 4.01 km/h2 and does so for 0.19 hours. What is the displacement of the bicyclist from the center of the nearest town at the end of the 0.19 hours of acceleration? Use the convention that north is positive, south is negative.

d. A runner is currently moving at a speed of 5.2 m/s. Over the time it takes the runner to travel the next 20.0 m she accelerates at a constant rate of 0.5 m/s2. What is the runner's new speed at the end of the 20.0 m?

e. A projectile is launched horizontally with a speed of 22.1 m/s. If the projectile takes 4.85 seconds to reach the ground, how far above the ground was the launch point?

f. A ball is dropped from a building that is 28.1 m tall. Assuming the ball is in free fall, how many seconds will it take the ball to reach the ground?

g. A ball is thrown straight up with a speed of 15.1 m/s. Assuming free fall, how many seconds will it take to return to the original height at which it was released?

h. A ball is thrown straight downward with an initial speed of 6.1 m/s. How many meters below the release point will the ball be at a time of 4.2 seconds later if air resistance is ignored?

i. A boat travels 12.0 km east at a speed of 10 km/h, then travels 18.2 km north at a speed of 20 km/h and finally travels 12.3 km east at a speed of 15 km/h. What is the magnitude of the average velocity for the boat over the entire trip?

j. A boat travels 14.7 km east at a speed of 10 km/h, then travels 13.7 km north at a speed of 20 km/h and finally travels 14.4 km west at a speed of 15 km/h. What is the average speed for the car over the entire trip?

  sequence  is a continuous and distinctive band of  stars  that appears on plots of stellar  color  versus  brightness. these color-magnitude plots are known as  hertzsprung–russell diagramsafter their co-developers,  ejnar hertzsprungand  henry norris russell. stars on this band are known as  main-sequence stars  or  dwarf stars. these are the most numerous true stars in the universe, and include the earth's  sun.after condensation and ignition of a star, it generates  thermal energy  in its dense core region through  nuclear fusion  of  hydrogen  into  helium. during this stage of the star's lifetime, it is located on the main sequence at a position determined primarily by its mass, but also based upon its chemical composition and age. the cores of main-sequence stars are in  hydrostatic equilibrium, where outward thermal pressure from the hot core is balanced by the inward pressure of  gravitational collapse  from the overlying layers. the strong dependence of the rate of energy generation on temperature and pressure to sustain this balance. energy generated at the core makes its way to the surface and is radiated away at the  photosphere. the energy is carried by either  radiation  or  convection, with the latter occurring in regions with steeper temperature gradients, higher opacity or both.the main sequence is sometimes divided into upper and lower parts, based on the dominant process that a star uses to generate energy. stars below about 1.5 times the  mass of the sun  (1.5  m☉) primarily fuse hydrogen atoms together in a series of stages to form helium, a sequence called the  proton–proton chain. above this mass, in the upper main sequence, the nuclear fusion process mainly uses atoms of  carbon,  nitrogen  and  oxygen  as intermediaries in the  cno cycle  that produces helium from hydrogen atoms. main-sequence stars with more than two solar masses undergo convection in their core regions, which acts to stir up the newly created helium and maintain the proportion of fuel needed for fusion to occur. below this mass, stars have cores that are entirely radiative with convective zones near the surface. with decreasing stellar mass, the proportion of the star forming a convective envelope steadily increases. main-sequence stars below 0.4  m☉undergo convection throughout their mass. when core convection does not occur, a helium-rich core develops surrounded by an outer layer of hydrogen.in general, the more massive a star is, the shorter its lifespan on the main sequence. after the hydrogen fuel at the core has been consumed, the star  evolves  away from the main sequence on the hr diagram, into a  supergiant,  red giant, or directly to a  white dwarf.

It is d, all the other ones say incorrect answer .

Gotta have a picture ^^