Question

By which velocity a ball be projected vertically upwards so that the distance covered is by it in 5th second is twice the distance it covers in its 6th aecond

Answer 1

hope this helps you.......

Answer 2

Answer:

u= 65m/s

Explanation: Sn= u + a/2 (2n-1)

according to ques

a = -g , where g = 10m/s2

S5 = 2 (S6)

u -g/2 (2(5) - 1) = 2 [u -g/2 (2(6) -1)]

u - g/2(9) = 2 [u - g/2 (11)]

put the value of g= 10 m/s2

u - 45 = 2u - 110

u = 110 - 45

u = 65m/s