A 1,kg block is being pushed against a wall by a force F = 75,N as shown in Figure. coefficient of f

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4-2.Friction

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A $1\,kg$ block is being pushed against a wall by a force $F = 75\,N$ as shown in the Figure. The coefficient of friction is $0.25.$ The magnitude of acceleration of the block is ........ $m/s^2$

A$10$

B$20$

C$5$

Dnone

Solution

$\mathrm{F} \sin 37^{\circ}-\mathrm{mg}-\mu \mathrm{F} \cos 37^{\circ}=\mathrm{ma}$
$\Rightarrow \mathrm{a}=20 \mathrm{m} / \mathrm{s}^{2}$

Standard 11

Physics

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