Question

A ball is projected with 20 root 2 at angle 45 degrees

Answer 1

Answer:

Final Answer : H = 125 (2-√3)m

|u| = 50(√3-1) m/s .

Steps and Understanding:

1) Let the initial velocity of projectile be u m/s at an angle of 30° from horizontal on top of a tower of height H.

For figure see pic.

2) Given,

Initial velocity, u = u (say)

Height of tower, h = H

Projection angle,theta = 30°

Fall at angle 45° with the horizontal on ground.

a(y) = -10m/s^2 (g)

a(x) = 0

time taken to reach ground, t = 5s

Vertical upward direction is +.

and vice versa.