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A 1 kg block is being pushed against a w...

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:

A

`10m//s^(2)`

B

`20m//s^(2)`

C

`5m//s^(2)`

D

none

Text Solution

Verified by Experts

The correct Answer is:
B

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