Question

A body is thrown upward and is caught after 4 seconds by thrower. What was initial velocity of the body?​

Answer 1

Answer:

initial velocity u = 19.6m/s2

Explanation:

time taken by a body is thrown upward and return to its initial point of projection is called time of flight

time of flight t = 2u/g

time of flight = t =4s

initial velocity = u = ?

acceleration due to gravity g = 9.8 m/s2

then initial velocity = u= tg/2

u = (4×9.8)/2 = 2× 9.8 = 19.6 m/s2