A truck is moving under a hopper with a constant speed of 20 m/s. Sand falls on the truck at a rate of 20 kg/s.
A truck is moving under a hopper with a constant speed of 20 m/s. Sand falls on the truck at a rate of 20 kg/s. The force acting on the truck due to falling of sand is
A) 40 N opposite to the motion of the truck
B) 400 N opposite to the motion of the truck
C) 40 N along the motion of the truck
D) 400 N along the motion of the truck
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