# Stopping distance of a moving vehicle is directly proportional to

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Stopping distance of a moving vehicle is directly proportional to
A. If both assertion and reason are trure and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanations of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason is false

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Let the distance travelled by the vehicle before it stops be d_s, then using v^(2) = u^(2) - 2ax
put v = 0, x = d_s(stopping distance) we get d_s = u^(2)/2a
Thus, the stopping distance is proportional to the square of the initial velocity.