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10 question-answers on laws of motion 1.        A man weighing 80 kg is standing on a trolley weighing 320 kg. The trolley is resting on friction less horizontal rails. If the man starts walking on the trolley along the rails at speed 1 m/s, then after 4 sec, his displacement relative to ground will be: (a)     5 m (b)    4.8 m (c)     3.2 m (d)    3.0 m Ans : ( c) 2.        A body is acted upon by a constant force, then it will have a uniform (a)     Speed (b)    Momentum (c)     Velocity (d)    Acceleration Ans : (d) 3.        Two bodies A and B are thrown upwards simultaneously with the same velocity. If the mass of A is greater than that of B, then (a)     A will go higher than B (b)    B will go higher than   A (c)     A ...