(a) Work, Energy and Power - Jamb Physics Past Questions and Answers

Question 71:

• JAMB 2021

A lead bullet of mass 0.05kg is fired with a velocity of 200ms\(^{-1}\) into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?

A. 50J
B. 100J
C. 150J
D. 200J

Question 72:

• JAMB 2021

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms\(^{-1}\) from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms\(^{-2}\))

A. 5J
B. 10J
C. 15J
D. 20J

Question 73:

• JAMB 2021

A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

A. 1.25 x 10\(^{4}\)W
B. 2.50x 10\(^{4}\)W
C. 1.25 x 10\(^{6}\)W
D. 2.50 x 10\(^{6}\)W