A block of metal weighing 2 kg is resting on a frictionless…

Physics Newton's Laws of Motion Second Law of Motion Single Correct MCQ

Published on: September 12, 2026

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/sec and at a speed of 5 m/sec . The initial acceleration of the block will be

\(2.5\ \mathrm{m/s^{2}}\)

\(5.0 \, \mathrm{m/sec}^2\)

\(10\ \mathrm{m/s^{2}}\)

None of the above

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The correct answer is:

Force on the block F \(= u \left( \frac{dm}{dt} \right) = 5 \times 1 = 5 \, N\)

Acceleration of block a \(\frac{F}{m} = \frac{5}{2} = 2.5 \, m/s^{2}\)

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