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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 = 1 t2 , where t is in seconds. Work done by the force in 2 seconds is 3
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3 J 8 -
8 J 3 -
19 J 5 -
5 J 19
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Correct Option: B
| Acceleration = | = | m / s2 | ||
| dt2 | 3 |
| Force acting on the body = 3 × | = 2 newton | |
| 3 |
| Displacement in 2 secs = | × 2 × 2 = | m | ||
| 3 | 3 |
| Work done = 2 × | = | J | ||
| 3 | 3 |
