A body of mass 3 kg is under a constant force which causes a displacement s in metres in it,given by the relation s=21t2 , where t is in seconds. Work done by the force in 2 seconds is:-
A
195 J
B
83 J
C
38 J
D
519 J
Medium
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Updated on : 2022-09-05
Solution
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Correct option is C)
By using work energy theorem
W = ΔKE = 21mv22 - 21mv12
Now s = 31t2⇒ v = 32t
⇒ v1 = 0, v2 = 32× 2 = 34 ms−1
Therefore W = 21× 3(34)2 - 21× 3 ×(0)2 = 38
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