Question

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Answer 1

reason :
as the raindrops us falling down with constant speed it's acceleration ,a=0 .hence net force acting on the drop = ma =0 .as the cork is floating on the surface of water it's weight is balanced by upthrust hence net force acting on the cork is zero

the force exerted by the engine is balanced by the frictional force due to rough road as the car is moving with constant velocity it's acceleration a=0 .hence net force is f=ma =0

whenever the body is thrown vertically upward gravitational pull earth gives it a uniform acceleration a =g in downward direction

hence net force of pebble= mg :0.05×10 =0.5 N vertically downward


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