A body started with velocity of 20ms−1 and moving with an acceleration of 2ms−2. The distance travelled by the body in the 8th second is
A
35m
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B
20m
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C
45m
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D
30m
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Solution
The correct option is A35m Given, u=20ms−1,a=2ms−2,n=8 As we know that the distance travelled by a particle in nth second is given as sn=u+12a(2n−1) ⇒s8th=20+12×2(2×8−1) ⇒s8th=20+15 ⇒s8th=35m