2. A block of mass 4 kg is resting on a rough
horizontal plane and is about to move when a
horizontal force of 30 N is applied on it. If g =
10 m/s?, the total contact force exerted by the
plane on the block is
1) 40 N 2) 30 N 3) 70 N 4)* 50 N.
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total contact force is 30 Newton because contact force is perpendicular to the gravitational force so gravitational force does not affect the the contact force so it remains same
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