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in Physics by (91.6k points)
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A nonzero external force on a system of particles. The velocity and the acceleration of the cente of mass are found to be `v_0 and a_0` at an instant t. It is possible that
A. `v(0) = 0, a_(0) = 0`
B. `v(0) != 0, a_(0) = 0`
C. `v(0) = 0, a_(0) != 0`
D. `v(0) != 0, a_(0) != 0`

1 Answer

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by (91.1k points)
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Best answer
Correct Answer - C::D
When external force is non zero, acc. Cannot be zero. However, the centre of mass may be at rest or may be moving with some velocity. Therefore,
`v_(0) = 0 or v_(0) != 0`, but `a_(0) != 0`.

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