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Question

A force of 15 N acts on an object of mass 10 kg for 12 s. The work done by this force is

A
1525 J
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B
1620 J
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C
2000 J
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D
875 J
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Solution

The correct option is B 1620 J
Given,
F=15 N
m=10 kg
t=12 s
u=0 m/s
Acceleration produced due to this force is
a=Fm=1510=1.5 m/s2
Velocity of the object after
12 s is
v=u+at
v=0+1.5×12
v=18 m/s
Therefore, work done by the force is
W=K.E
W=K.EfK.Ei=12mv212mu2
W=12×10×1820=1620 J

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