An automobile moving at a speed of 72km h

Asked by admin @ 23/08/2021 in Physics viewed by 317 People

an automobile moving at a speed of 72km h reaches the foot of a smooth incline when the engine is switched off. how much distance does the automobile go up the incline before stopping.the incline makes an angle of 30degree with the horizontal.take g=9.8

Answered by admin @ 23/08/2021

It will move up the plane until the velocity becomes zero.
at the instant when automobile is at the base,
u= 72Km/s=20m/s.
just when it moves up the plane gravity 's sin component cause retardation which is equal to gsin30°.
using v^2-u^2= 2as.
then max distance travelled=
s= 40.8m

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