A force acts for 0.1 seconds on a body of mass 1.2kg initially at rest . The force then seases to act and the body moves through 2m in the next 1second . Find the magnitude of force .
Asked by Sushma
3rd September 2017,
2:11 PM
Answered by Expert
Answer:
1) There are two motions of the body - First when force acts for 0.1 s and second when force ceases and body moves with constant speed for 1 s.
2) For the second part, force ceases and speed is constant. So, v = s/t = 2/1 = 2 m/s.
3) Now, this is the speed with which the body attains when force ceases to act. So, the acceleration of the body in first 0.1 s is
a = (v-u)/t = (2-0)/0.1 = 20 ms-2
4) Therefore, the force is F = ma = 1.2 × 20 = 24 N
Answered by Expert
4th September 2017,
11:44 AM
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