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A body of mass m = 2kg changes its veloc...

A body of mass m = 2kg changes its velocity `v_(1)=(1+2j+3k)m//s " to " v_(2)=(-2i+2j-k)m//s`. during 2 seconds.
(a) Find the magnitude of change in momentum of the body.
(b) What is the magnitude of the average force experienced by the body?

Text Solution

Verified by Experts

(a) `Delta vecp=vecp_(2)-vecp_(1)=m(vecv_(2)-vecv_(1))`
`=2[(-2hati+2hatj-hatk)-(hati+2hatj+3hatk)]=2(-3hati-4hatj)`
`|DeltavecP|= 2sqrt(3^(2)+4^(2))=10`kg-m/s
(b) `|vecF_("avg")|=(|Deltavecp|)/(Deltat)=(10)/(2)=5N`
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