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
Verified Correct Answer: C.
Physical Principles & Numerical Solution
X = ut + \(\frac{1}{2}\)at2
= (0 x 4) + (\(\frac{1}{2}\) x 0.1 x 4 x 4)
= 0.8m
workdone = force x distance
= 40 x 0.8
= 32J
Source: Myschool Past Questions Archive (Record #28404)