Question

A 2000 kg body is moving with a velocity of 54 kilometre per hour. Find the change in in momentum of the body when it stops. If it is stops in 15 seconds calculate the retarding force.
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Answer 1

Answer:

we know that momentum equals to mass × velocity

Explanation:

Here we have mass= 2000kg

velocity 54 km/hr= 54× 5 /18 = 15 m/s

momentum = 2000× 15=30000kgm/s

momentum when it's stop = 2000× 0(because object will stop after moving) = 0kgm/s

change in momentum = 0-15=-15kgm/s

force equals to mass × accelaration

Here I have mass = 2000 kg

accelaration = v-u/t=0-15/15=-1

so

force = 2000×-1=-2000N