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A block A of mass 4 kg is kept on ground...

A block `A` of mass `4 kg` is kept on ground. The coefficient of friction between the block and the ground is `0.8`. The external force of magnitude `30 N` is applied parallel to the ground. The resultant force exerted by the ground on the block is `(g = 10 m//s^(2))` a) 40 N b) 30 N c) zero d) 50 N

A

40 N

B

30 N

C

0 N

D

50 N

Text Solution

Verified by Experts

The correct Answer is:
D
`N=mg=40N`
`(f_S)_(max)=muN=(0.8)(40)=32N`
`f_S=`ext force`=30N`
`R^2=N^2f_S^2=(50)^2`
`R=50N`
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