A body of mass 10 kg is moving with an initial speed of 20 m/s. The body stops after 5 s due to friction between the body and the floor. The value of the coefficient of friction is (Take acceleration due to gravity g = 10 ) [2023]

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Solution

Q.
A body of mass 10 kg is moving with an initial speed of 20 m/s. The body stops after 5 s due to friction between the body and the floor. The value of the coefficient of friction is
(Take acceleration due to gravity g = 10 ${ms}^{- 2}$ ) [2023]

1 0.2

2 0.3

3 0.5

4 0.4

Ans.
(4)

$a = - μ g$

$∵$ $v = u + a t$

$0 = 20 + (- μ \times 10) \times 5$

$50 μ = 20$

$μ = \frac{2}{5} = 0.4$

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