Work, Energy and Power - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1986

Two objects, one having three times the mass of the other, are dropped at the same time from a tall building. When they are above the ground, the two objects will have the same

A. Momentum
B. Kinetic energy
C. Potential energy
D. Acceleration

Question 12:

• JAMB 1987

A constant force of 40N acting on a body initially at rest gives an acceleration of 0.1ms^-2 for 4s. Calculate the work done by the force

A. 8J
B. 10J
C. 32J
D. 160J

Question 13:

• JAMB 1987

A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms^-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms^-1]

A. 40%
B. 35%
C. 20%
D. 15%

Question 14:

• JAMB 1988

How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms^-2]

A. 5.3s
B. 34.5s
C. 41.6s
D. 52.8s

Question 15:

• JAMB 1990

To keep a vehicle moving at a constant speed v, requires power P, from the engine. The force provided by the engine is

A. \(\frac{p}{v}\)
B. \(\frac{1}{2}\) v
C. Pv
D. \(\frac{p}{v^2}\) v