Question

A body of mass 6kg puts in rest. How much force exerts on it so that velocity of 4m/s produces in it in 4 seconds?​

Answer 1

Answer:

From above figure

A→B

u = 4m/s v=0 t=2sec a=?

v=u+at

0=4+a(2)

a=−2m/s

2

so,

force = ma

=2×2=4N

Answer 2

Explanation:

ANSWER

Acceleration produced in the body (a)=

dt

2

d

2

S

=

dt

2

d

2

(

4

t

2

)

=

2

1

m/s

2

So, Value of Force =ma=3N

So, work done =F.S=∫

0

2

(

4

3t

2

)dt=2J