Question

car is travelling at constant velocity. Its brakes are then applied, causing uniform deceleration.

Which graph shows the variation with distance s of the velocity v of the car?






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Answer 1

Explanation:

In first half , the car moves with constant velocity . So, the graph will be parallel to s−axis in first half.

Now, 

a=v,ds/dv ...........(1)

Since a is constant and negative and v is decreasing im magnitude and positive .

So, from eqn (1) it is clear that 

dsdv is positive and its magnitude decreases. 

= ds/dv>0