A. 4.0 x 102N
B. 2.0 x 103N
C. 4.0 x 103N
D. 4.0 x 104N
Correct Answer:
Option C = 4.0 x 103N
Explanation
Work done = kinetic energy of the stone
½Fe= ½mv²
Given m = 500g = 0.5kg; v = 40m/s ; e = 20cm = 0.2m
F=mv²/e
= 0.5×(40)²/0.2
= 4.0 × 103 N
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