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