Question

A starts from rest and moves with acceleration A1 B starts from rest and moves with an acceleration A2 if the displacement of A in 5th second is the same as that of B in the same interval find the ratio of A1 and A2

Answer 1

For the body ‘A’, the distance travelled in 5th second is,

S1 = 0 + ½ a1 (2n - 1)

=> S2 = 9/2 a1   [n = 5]

For the body ‘B’, the distance travelled in the 5th second after the start of A is actually the distance travelled by the body B in the 3rd second, since, B starts 2 s later.

Therefore,

S3 = 0 + ½ a2 (2n - 1)

=> S3 = 5/2 a2  [n = 3]

Since, the distance travelled are same,

9/2 a1 = 5/2 a2

=> a1 : a2 = 5 : 9

Answer 2

Answer:

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