Question

hello friends
A body of mass 2 kg moving with velocity 4 m/s horizontally stops after 2s . if the body is to be kept in motion at the same surface with 4m/s,force needed is:
a)1N
b)2N
c)4N
d)18N

Answer 1

hey mate ur ans is 3....

Answer 2

Hlo mate :-

Solution :-

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☆ We have,v=u+at

or a=v-u/t

In this question the acceleration provided to the body=(0-4)/2=-2m/s-2

De acceleration=2 m/s-2

The force which provided the de-acceleration,F=ma=2x2=4N

Now this force is to be opposed ,hence a force of 4N is required to keep the body moving with velocity of 4m/s.


Vishal Ajwani answered this

m=4

u=4m/s

v=0

t=2

a=(v-u)/t

=-ve2m/s2

therefore acc.=2m/s2 for uniform velocity,

f=ma,

=2*2

=4N

from my point of view the force reqd. is 4N

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