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Post You Physics, Mathematics and Chemistry O & A Levels. | Resources and E-Books are also available

Do you find physics A-Levels (Ed-excel) difficult?


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can any one help in this MCQ..


a car of mass m travelling with a velocity v, comes to rest over a distance d in time t.

the connstant frictional force acting on the car while it is braking is found using..

a. mv / 2t
b. 2mv / t
c. mv^2 / 2d
d. 2mv^2 / d
 
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can any one help in this MCQ..


a car of mass m travelling with a velocity v, comes to rest over a distance d in time t.

the connstant frictional force acting on the car while it is braking is found using..

a. mv / 2t
b. 2mv / t
c. mv^2 / 2d
d. 2mv^2 / d

Since Work done (Force x Distance) = KE ( mv^2/2 ) This also means that Force = KE (Work done) / Distance = mv^2/2d

I hope it's understandable the way I explained. Option C should be correct answer.
 
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