A skeeball has a mass of 0.5 kg. If the skeeball is rolling at 5 m/s, what is
the skeeball's kinetic energy? *
A) 2.5 J
B)6.25 J
C)12.5 J
D) 25 J

(B)

Correct Answer is b. At the Top of its Path

Explanation:

Since, the ball is thrown vertically upwards, the moment ball reaches the maximum height its velocity becomes zero at that instant only.

Also, as the ball is thrown under the action of gravity, its acceleration would remain equal to acceleration due to gravity which is g = 9.8 m/s2. For upward movement g = -9.8 m/s2 and for downward movement g = 9.8 m/s2.

Note:

Velocity is defined as change in speed with respect to time.

Acceleration is defined as change in velocity with respect to time.