Question

find the rate of change in momentum if mass of an object is 20 kg at rest attains a speed of 10m/s in 5 seconds​

Answer 1

momentum =mass x acceleration
acceleration=final velocity - initial velocity/time
=10-0/5
acceleration=2m/s^2
so momentum=20*2
Ans. 40kg m/s

Answer 2

To Find :

• change in Momentum

Solution :

• mass of object = 20kg
• initial velocity (u) = 0
• Final velocity (v) = 10m/s
• time = 5

$\green{\textrm{Change in Momentum = mv - mu}}$

= 20 × 10 - 20 ×0

= 200 - 0

= 200 kg m/s

OR

• p = mv

›› p = 20 × 10

›› p =200 kgm/s

Hence

• momentum of body is 200 kgm/s.

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