Question

what is the change in momentum of a car weighing 1500 kg. when its speed increases from 36 km/h to 72 km/h uniformly.
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Answer 1

Answer:

hy

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Explanation:

GIVEN,

         MASS, m                    = 1500 kg

         INITIAL VELOCITY,u  = 36 km/h = 36*5/18 = 10 m/s

         FINAL VELOCITY ,v   = 72 km/h =  72*5/18=  20 m/s

          FORMULA : 

                  CHANGE IN MOMENTUM,p = mv - mu

                                1500*20 - 1500*10

                                 30000 - 15000

                                   = 15000 kg m/s

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Answer 2

Explanation:

Mass of car = 1500kg

Initial velocity =36km/h

Initial linear momentum = mu

= 1500×36

=54000kgkmh-1

Final velocity =72km/h

Final linear momentum = mv

= 1500×72

= 108000 kgkmh-1

Change in momentum = mv-mu

=108000-54000

=54000kgkmh-1

Or 15000kgms-1

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