Question

When a force is applied on a body of mass 10 kg for a period of 4 s, the velocity of the body
changes from 6 m/s to 8 m/s.
a)
What is the initial momentum of the body?
b) What is the final momentum of the body?
c) What is the change of momentum of the body?​

Answer 1

FINAL ANSWER:-

$a)\:initial\:momentum=60kgm/s\\b)\:final\:momentum =80kgm/s\\c)\:change \:of \:momentum=20kgm/s$

GIVEN:-

$m=10kg\\u=6m/s\\v=8m/s\\t=4s$

FORMULAS USED:-

• $initial\: momentum= mu$

• $final\:momentum=mv$

• $change\:in\:momnetum=m(v-u)$

SOLUTION:-

a) the initial momentum of the body ⇒ $initial\: momentum= mu$ ⇒  $10*6$  ⇒ $60kgm/s$

b) the final momentum of the body ⇒ $final\:momentum=mv$  ⇒ $10*8$ ⇒  $80kgm./s$

c) the change of momentum of the body ⇒ $change\:in\:momnetum=m(v-u)$ ⇒  $10(8-6)$  ⇒ $10*2$  ⇒ $20 kgm/s$

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