Question

A force of 6 N acts on a body at rest and mass 1 kg. During this time, the body attains a velocity of 30 m/s. The time for which the force acts on the body is
(1) 10 s
(2) 8 s
(3) 7 s
(4) 5 s

Answer 1

Correct option is : 4

5 seconds

explanation :

F=6N

u= 0 m/s

m=1kg

V=30 m/s

t=?

F=ma=m(v-u)/t

t= m(v-u)/F= 1x (30-0)/6

=30/6= 5 sec