Question

A motor car of mass 1200 kg is moving along a straight line

which uniform velocity of 90

kilometers per hour. is it still

slow down to 18 km per hour in

4 seconds by an unbalanced

external Force. calculate the

acceleration and change in

momentum and also calculate

the magnitude of force required.

Answer 1

hi buddy
here initial velocity or u = 90kph
final velocity or v =18kph
time or t =4
acceleration=v-u/t
=18-90/4
= -18m/s square

Change in momentum=final momentum-initial momentum
=18X1200-90X1200
=21600-108000
= -86400kgm/s

Force = mass X acceleration
=1200 X -18
= -21600 N

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hope this helps