A nonzero external force acts on a system of particles, The velocity and the acceleration of the centre of mass are found to be v0 and a0 at an instant t. It is possible that :
A
v0=0,a0=0
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B
v0=0,a0≠0
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C
v0≠0,a0=0
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D
v0≠0,a0≠0
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Solution
The correct options are Av0=0,a0≠0 Dv0≠0,a0≠0 if non-zero external force on any particle the acceleration of its COM cannot be zero where as velocity can be anything at the moment (+ve , 0 , -ve )