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i) If the net force acting on a body is ...

i) If the net force acting on a body is zero, will it remain necessarily at rest?
(ii) Two bodies of mass M and m are allowed to fall from the same height. If air resistance for each body be same, will the two bodies reach the ground simultaneously?

Text Solution

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(i) No, not necessary. When net force acting on the body is zero, it may be in the state of uniform motion along a straight line.
ii) No. The heavier body will reach the ground earlier. This is because, net downward force on body of mass M = (Mg - F) . Therefore, its acc.,
`a = (Mg - F)/(M) = g - (F)/(M)` and acc. of body of smaller mass, `a = g - (F)/(m)`
As `M gt m :. a gt a`. Hence heavier body will reach the ground earlier than the lighter body.
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