Answer:
(i) Everybody in the universe stays in a state of rest or of uniform motion along a straight line until an unbalanced external force acts on it to change its state. (2)
(ii)
(1)
Force,
(1)
Or
To every action there is an equal and opposite
reaction, e.g., when we exert a force (action) on a wall by pushing it with the palm of our hand, wall also exerts a force (reaction) on our palm. (1)
(ii)
(a) (1)
(b) Initial momentum of the system = momentum of the bullet (As the momentum is conserved). (1)
(c) Recoil velocity of the revolver V= ? Initial momentum = Final momentum
(2)
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