a car is being driven at a speed of 20 ms-1 when brakes are applied to bring it to rest in 5s.The deceleration produced in this case will be
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5
Given,
Initial velocity , u = 20 m/s
time taken to stop car , t = 5sec
According to question, after 5 sec car brings to rest.
so, final velocity of car , v = 0 m/s
Use formula,
v = u + at,
0 = 20 + a5
5a = -20 ⇒ a = -4 m/s²
Here negative sign indicates that motion is retarding .
ashwin9759:
retarding means
Decceleration
That means the bodies acceleration is decreasing.
cant understand that how 20 become -
See the answer is in negative that means the body is deccelerating
Which means the body may be acted upon my brakes
thank you very much
Wlcm! :)
Answered by
0
A=V_U/t
A= 0_ 20/5
A= 4 metre per second square (retardation)
A= 0_ 20/5
A= 4 metre per second square (retardation)
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