Question

A 0.145 kg baseball is thrown horizontally at 15 m/s from a platform, so that it starts at 5.2 m above the ground. How much has its kinetic energy increased when it reaches the ground? 16 J , 24 J , 0 J , or 7.4 J ? :/

Answer 1

7.4J
final kinetic energy
= initial potential energy
= mass x gravitational force x height
= 0.145 x 9.81 x 5.2
= 7.39674 J