A body with an initial velocity of 18kmh−1 accelerates uniformly at the rate of 9cms−2 over a distance of 200 m. Calculate its final velocity in ms−1.
A
0
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B
7.81
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C
15.6
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D
3.9
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Solution
The correct option is D 7.81 Given, initial velocity u=18kmh−1 =18000m60×60=5ms−1
Acceleration a=0.09ms−2 and distance s = 200 m From equation of motion v2=u2+2as, We get, v=√52+2×0.09×200m/s=7.81m/s