Answer:
Initial velocity, u = 10 m/s
Explanation:
It is given that,
Position of the body with respect to ground, h = 15 m
Acceleration due to gravity, [tex]a=10\ m/s^2[/tex]
Final speed of the body, v = 20 m/s
Let u is the initial speed of the body with which it was thrown. It can be calculated using third equation of kinematics as :
[tex]v^2-u^2=2ad[/tex]
[tex](20)^2-u^2=2\times 10\times 15[/tex]
u = 10 m/s
So, the initial velocity of the body was 10 m/s. Hence, this is the required solution.
