Aball is thrown with a speed of 20 m/s at an angle of 40°. which of the
following statements describes the motion of the ball at the top of its
trajectory?
a. the horizontal component of velocity is increasing
b. the vertical component of velocity is zero.
c. the vertical acceleration is zero

d. the horizontal component of velocity is zero

Aprojectile is launched from ground level with an initial velocity of v 0 feet per second. neglecting air resistance, its height in feet t seconds after launch is given by s equals negative 16 t squared plus v 0 t. find the time(s) that the projectile will (a) reach a height of 192 ft and (b) return to the ground when v 0equals112 feet per second. (a) find the time(s) that the projectile will reach a height of 192 ft when v 0equals112 feet per second. select the correct choice below and, if necessary, fill in the answer box to complete your choice.

Adolphin emits ultrasound at 100khz and uses the timing of reflections to determine the position of objects in the water. part a what is the wavelength of this ultrasound? assume that temperature of water is 20 degrees c. answer in cm

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical