A car is moving in a straight line with speed 18 km per hour. It is stopped in 5 seconds by applying the brakes.Find the speed of the car after 2 seconds of applying the brakes in metre per seconds.
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A car is moving in a straight line with speed 18 km/h.It is stopped in 5 s by applying the brakes.find: :.iii)the speed of the car after 2 s of applying the brakes.
Ask for details Follow Report by Singhsumita40 18.04.2015
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rational
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Initial speed, u=18km/h=5m/s
t=5s
final speed, v=0km/h
velocity of car t seconds after applying the breaks is given by
v(t)=u+at
plugin the given values above and find a :
0=5+a(5)\implies a=-1m/s^2
therefore the velocity of car as a function of time is
v(t)=5-t
plugin t=2 for the velocity of car 2 seconds after applying breaks:
v(t)=5-2=3m/s=10.8km/h
sushmita1233:
thnk u
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