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Q.

A car is moving along a circular arc at a speed of 20 ms-1 . The radius of the arc is 10 m. If the speed is increased at the rate of 30 ms-2, what is the resultant acceleration ?

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a

10 m s-2

b

50 m s-2

c

70m s-2

d

250m s-2

answer is B.

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Detailed Solution

Here, ar=v2r=20×2010=40ms−2ar=30ms−2a=ar2+at2=302+402=50ms−2Hence (2) is the choice
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