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

Question 36:

• JAMB 2004

A body of mass 4kg is acted on by a constant force of 12N for 3 seconds. The kinetic energy gained by the body at the end of the time is

A. 144J
B. 162J
C. 81J
D. 72J

Question 37:

• JAMB 2005

In the figure above, the work done by the force of 100N inclined at an angle of 60^o to the object dragged horizontally to a distance of 8m is

A. 800J
B. 600J
C. 100J
D. 400J

Question 38:

• JAMB 2007

A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60^o to the floor.

The work done after a distance of 3m is

A. 3 J
B. 4 J
C. 5 J
D. 6 J

Question 39:

• JAMB 2008

If a body mass 5kg is thrown vertically upwards with velocity u,at what height will the potential energy equal to the kinetic energy?

A. H =(u)²/g
B. H = (u)²/4g
C. H = (2u)²/g
D. H = (u)²/2g

Question 40:

• JAMB 2009

If a cage containing a truck of coal weighing 750 kg is raised to a height of 90 m in a minute, what is the total power expended?
[g = 10 ms²]

A. 11.50 kw
B. 12.60 kw
C. 11.25 kw
D. 12.10 kw