A one rupee coin starting from rest rolls down a distance of 1 m on an inclined plane at an angle of 30 ° with the horizontal. Assuming that g = 9.8 m s - 2 , the time taken is

Question

A one rupee coin starting from rest rolls down a distance of 1 m on an inclined plane at an angle of 30 ° with the horizontal. Assuming that g = 9.8 m s - 2 , the time taken is, 0 . 68 s, 0 . 6 s, 0 . 5 s, 0 . 7 s

MARKS App · Accepted Answer

l = 1 m , θ = 3 0 o , g = 9 . 8 1 m s - 2 , t = ? K 2 = 1 2 R 2 a = 9 . 8 1 × 1 2 1 + 1 2 = 4 . 9 × 2 3 ⇒ l = 1 2 a t 2 ⇒ 1 = 1 2 × 4 . 9 3 × 2 × t 2 ⇒ t = 3 4 . 9 = 0 . 7 s

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