Question

Q4. Momentum of a body increases from 20kgm/s to 40kgm/s in 5 seconds, then the force
applied is
A) 4 N
b)-4 N
c)12 N
d)-12 N


guys plzz ans me...​

Answer 1

Answer:

Option (b) is write answer

Explanation:

Momentum = Force ×Time

Momentum /Time = Force

(20 - 40) / 5 = Force

Force = -20/5 = -4

Force = -4N

Answer 2

Answer:

(A)The force applied on the body is 4N

Explanation:

Given that,

The momentum of the body changes from 20kgm/s to 40kgm/s in 5 seconds.

Therefore,the initial momentum of the body is 20kgm/s

$=>P_{i}=20kgm/s$

And the final momentum of the body is 40kgm/s

$=>P_{f}=40kgm/s$

From Newton's second law of motion,we know that the Force applied on a body is rate of change of its momentum.Mathematically,

$F=\frac{dP}{dt}$

Simplifying it further we get

$F=\frac{P _{f} - P _{i}}{t - 0} \\ = >F = \frac{40 - 20}{5 - 0} = \frac{20}{5} = 4N$

Therefore,The force applied on the body is 4N

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