A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg s- 1 and at a speed of 5 m s- 1 . The initial acceleration of the block will be

Question

A block of metal weighing 2 kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1 kg s- 1 and at a speed of 5 m s- 1 . The initial acceleration of the block will be (A) 2.5m s- 2 (B) 5.0ms- 2 (C) 10 m s- 2 (D) None of the above

Tardigrade Admin · Accepted Answer

Force on the block F=u ((d m/d t))=5× 1=5 N ∴ Acceleration of block a=(F/m)=(5/2)=2.5 ms- 2

Q. A block of metal weighing $2 k g$ is resting on a frictionless plane. It is struck by a jet releasing water at a rate of $1 k g s^{- 1}$ and at a speed of $5 m s^{- 1}$ . The initial acceleration of the block will be

$2.5 m s^{- 2}$

$5.0 m s^{- 2}$

$10 m s^{- 2}$

None of the above

Force on the block $F = u (\frac{d m}{d t}) = 5 \times 1 = 5 N$
$∴$ Acceleration of block $a = \frac{F}{m} = \frac{5}{2} = 2.5 m s^{- 2}$

Q. A block of metal weighing 2kg is resting on a frictionless plane. It is struck by a jet releasing water at a rate of 1kgs−1 and at a speed of 5ms−1 . The initial acceleration of the block will be

2.5ms−2

5.0ms−2

10ms−2