Question

V A block of weight 4 kg is resting on a smooth horizontal plane. If it is struck by a jet of water at the rate of 2 kg s and at the speed of 10 m s', then the initial acceleration of the block is (a) 15 m s-2 (b) 10 m s-2 (c) 2.5 m s -2 (d) 5 m s-2​

Answer 1

V A block of weight 4 kg is resting on a smooth horizontal plane. If it is struck by a jet of water at the rate of 2 kg s and at the speed of 10 m s', then the initial acceleration of the block is (a) 15 m s-2 (b) 10 m s-2 (c) 2.5 m s -2 (d) 5 m s-2

Solution:-

Weight of block = 4 kg

( Resting on a smooth horizontal plane )

If it is struck by a jet of water

The weight of water = 2 kg

Speed of water = 10 m ) s

Initial acceleration of the block = ?

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The initial acceleration of block = F / m

= 2 kg s-¹ × 10 m s-² / 4

= 5 m s-²

so , the correct option is ( d ) 5 m s-²

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Definition of Acceleration :-

Acceleration is the rate at which velocity changes with time, in terms of both speed and direction .