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

Question 41:

• JAMB 2009

If a load of mass 10N stretched a cord by 1.2cm, what is the total work done?

A. 6.0 x 10^-2J
B. 7.6 x 10^-2J
C. 1.8 x 10^-2J
D. 6.6 x 10^-2J

Question 42:

• JAMB 2010

A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is

A. 0.500 J
B. 0.250 J
C. 0.050 J
D. 0.025 J

Question 43:

• JAMB 2011

A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?[g = 10 ms^-2]

A. 600 J
B. 150J
C. 300 J
D. 450 J

Question 44:

• JAMB 2012

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

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

Question 45:

• JAMB 2012

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