You are throwing a ball straight up in the air. at the highest point, the ball’s

a. velocity & acceleration are at zero
b. velocity is nonzero but it’s acceleration in zero
c. acceleration is nonzero, but it’s velocity is zero
d. velocity and acceleration are both nonzero

Which would not reduce the amount of green house gasses in the air

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.