A `1 kg` block is being pushed against a wall by a force `F=75N` as shown in the Figure. The coefficient of friction is `0.25`. The magnitude of acceleration of the block is `:`

Options

A. `10 m//s^(2)`
B. `20 m//s^(2)`
C. `5 m//s^(2)`
D. none

Answer

B

Explanation

As the upward force (45N) is greater than total downward force
(25N) hence, it has an upwards acceleration
`SigmaF_(x)=0 rArr N=60 N`
`Sigma F_(y)=ma_(y)`
`rArr 45-25=(1)a`
`a=20 m//s^(2)`