A car moving along a straight road with certain velocity can be brought to rest in 2s by a retarding force F1. If retarding force F2 is taken instead of F1,the car can be brought to rest in 3s. If both forces F1 & F2 act simultaneously on the same car, then the time in which car can be bought to rest is
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Answer:
the car can be brought to rest in seconds
Explanation:
Let the mass of the car be m and its initial velocity be u
Acceleration due to force
Acceleration due to force
From the first equation of motion
Similarly,
When the combined force is acting
acceleration
Let the car stops in time t when the combined force is causing retardation
Therefore, from first equation of motion
seconds
Therefore, the car will stop in seconds
Hope this helps.
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