Question

For how much time should the force of 400N be exerted on a body of mass 8 kg to increase its velocity from 150 m/s to 300 m/s?

Answer 1

F = ma
a = v-u/t

F= m * v-u/t
400= 8 * 300-150/t
400= 8* 150/t
400/8=150/t
50t = 150
t= 150/50
t= 3 s

Answer 2

Answer:

The time to increase the velocity  of a body from 150 m/s to 300 m/s is 3 sec, when the force of 400N be exerted on a body of mass 8 kg.

Explanation:

Given, the force exerted on a body, F = 400N

The mass of the body, m = 8 Kg

The initial velocity of body, v = 150 m/s

The final velocity of the body, u = 300 m/s

We know from the Newton's second law, the force is given by:

F = ma

$a =\frac{F}{m}$

$a=\frac{400N}{8Kg}$

$a=50m/s^2$

From the first equation of motion:

$v = u +at$

$t = \frac{v-u}{a}$

Substitute the value of  a, v and u in the above equation:

$t =\frac{300-150}{50}$

$t =\frac{150}{50}$

$t = 3\;sec$

Therefore, the time taken by the body to  increase its velocity from 150 m/s to 300 m/s is 3 seconds.

To know more about "First equation of motion"

https://brainly.in/question/335710

To know more about "Newtons first law from newtons second law"

https://brainly.in/question/9228813