Question

force of 50 N moves a body.(a) Frictional force exerted on the body is less than 50 N(b) Frictional force exerted on the body is more than 50 N(c) None of these(d) Both (a) and (b)

Answer 1

Answer:

Let the mass of the body be m.

Therefore, acceleration, a=

m

50

We have, v

2

−u

2

=2as

∴v

2

−0

2

=2.

m

50

.60

In order to stop the body within 20m, we should apply on opposing force of F.

∴v

2

−u

2

=2.

m

F

.20

=

m

2×50×60

=

m

2.F.20

∴F=150N

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