Question

A criket ball is thrown by a player vertically upwards. it returns 8 seconds later . calculate 1.the greatest height reached and 2. initial velocity of thrown?

Answer 1

2) time taken to go up= 4 sec
initial speed = u
v=u-gt
0=u-10(4)
u=40m/sec

1) h=ut - 1/2 gt^2
h=40(4)- 1/2 x 10 x 16
h=160-80
h=80m