a. 15 kg ball is dropped from the top of a 150 m building. What is the kinetic energy of the ball when it passes the 16th floor at a height of 63 m?

Distance convered 150m to 60m above the ground = 150 - 60=87m

final velocity to cover 87 m as follows:

v^2 = u^2 + 2gh

v^2 = 0^2 + 2*9.8**87

v^2=1705.2

v = ✓1705.2

v=41.29 m/s

kinetic energy of the ball as follows:

kinetic energy = 1/2mv^2

E = 1/2*15*41.29^2

E = 12.8KJ