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Question

A cart begins from rest at the top of a long incline and rolls with a constant acceleration of 2m/s2. How far has the cart moved along the incline after rolling for 3 seconds?

A
3 meters
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B
6 meters
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C
9 meters
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D
18 meters
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Solution

The correct option is D 9 meters
Given:
Initial velocity of cart u=0m/s
Acceleration of the cart a=2 m/s2
Distance covered by cart in 3 seconds is given second equation of motion,
S=ut+12at2 where t=3 seconds
S=0+12×2×32=9 meters

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