When throwing a ball straight up, which of the following are correct about the magnitudes of its velocity (v) and its acceleration (a) at the highest point in its path? a. both v = 0 and a = 0.
b. v ≠ 0, but a = 0.
c. v = 0, but a = 9.80 m/s^2.
d. v ≠ 0, but a = 9.80 m/s^2.
e. There is not enough information to determine the velocity (v) and acceleration (a).

c. v = 0, but a = 9.80 m/s^2.

Explanation:

When you throwing a ball straight up, at the highest point of the trajectory, the ball stops due to the gravitational force of the Earth. It produces a deceleration on the ball and in its highest point the speed is zero. After it, the ball go down with a variable speed.

The acceleration of the ball is always different of zero because the acceleration of the ball is always the produced by the gravitational force of the Earth. That acceleration is g = 9.8m/s^2.

In conclusion, what you have is that, when the ball reaches its highest point, the speed of the ball is zero, and the acceleration is g

The answer is:

c. v = 0, but a = 9.80 m/s^2.

0.3x0.21x0.08kg=mass 1 sheet

mass 500 = 500xmass 1

volume pile = 0.3x0.2x0.048

density=mass/volume= 500xmass 1/0.3x0.2x0.048

v patient student

12000j is work done