Question

By how much does the momentum of a body of mass 5 kg changes when its speed decreases from 20 metre per second to 0.20 metre per second increases from 30 metre per second

Answer 1

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✓✓By how much does the momentum of a body of mass 5 kg change when it's speed decreases from 20m/s to 0.20 m/ s and increases from 30 m/s to 40 m/s.

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when it's Speed decreases from 20m/s to 0.20m/s.

then,

• $\bf\:mass\:of\:the\:body\:(m)=\:5\:kg$

• $\bf\:initial\:velocity\:(u)=\:20\:m/s$

• $\bf\:final\: velocity\:(v)=\:0.20\:m/s$

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we know that,

change in momentum $\bf\:=m(v-u)$

$\bf\:=5(0.20-20)\:kg\:m/s$

$\bf\:=5\times\:(-19.8)\:kg\:m/s$

$\bf\:=-99\:kg\:m/s$

Here negative sign indicates that the momentum decreases.

when it's speed increases from 30m/s to 40m/s.

then,

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• $\bf\:mass\:of\:the\:body\:(m)=\:5\:kg$

• $\bf\:initial\:velocity\:(u)=\:30\:m/s$

• $\bf\:final\: velocity\:(v)=\:40\:m/s$

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Change in momentum $\bf\:=m(v-u)$

$\bf\:=5(40-30)\:kg\:m/s$

$\bf\:=5\times\:10\:kg\:m/s$

$\bf\:=50\:kg\:m/s$

Answer 2

Answer:

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