Question

A 4 kg bowling ball rolls at a speed of 5 m/s on the roof of a building that is 30 meters tall. What is its kinetic energy?

A. 10 J
B. 50 J
C. 120 J
D. 1,176 J

Answer 1

ans: B

Kinetic energy =
`(1)/(2) mv^(2)`

=
`(1)/(2) (4)(5^(2) )`

= 50J

ps. the height will only affect its potential energy, not kinetic.