A mass of 1 kg kept in an inclined plane with inclination with respect to horizontal plane and it is at rest initially.

Question

A mass of 1 kg kept in an inclined plane with $30 °$ inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s. The work done by the frictional force in time 2 s is ______ J. (Take g = 10 ${m/s}^{2}$ ) [2026]

Smart Achievers · Accepted Answer

(1)

$f_{x} = m g \sin θ = 5 N$

$W = f_{s} (v t) \sin θ = 5 \times 4 \times 2 \times \frac{1}{2} = 20 N$

Solution

Q.
A mass of 1 kg kept in an inclined plane with $30 °$ inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of 4 m/s. The work done by the frictional force in time 2 s is ______ J. (Take g = 10 ${m/s}^{2}$ ) [2026]

1 20

2 25

3 30

4 10

Ans.
(1)

$f_{x} = m g \sin θ = 5 N$

$W = f_{s} (v t) \sin θ = 5 \times 4 \times 2 \times \frac{1}{2} = 20 N$

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