Speed of the projectile at its maximum height is only along horizontal direction
so at highest point

now when he is at half of the maximum height the speed will be in x and y direction both

here it is given that




also we know that

here we know that maximum height is given as



now from above


also we know that angle of projection is


so angle is


Answer:
the net work is 0
Explanation:
in an isolated system, there is no energy entering or exiting the system, and since work is dependent on the change in energy (W = ΔE) , with no change in energy, there is no work done. the net work done on or by the system must be 0
The sun is the centre of our solar system
Answer:1 trip around the earth is an angular displacement of 2*pi
3.6525*10^2 days
I
Explanation:24 h/1 day * 3.600*10^3 s/1h = 3.156*10^7 s
Angular speed = angular displacement / time
Angular speed = 2*pi rads / 3.156*10^7 s = 1.9910*10^-7 rad/s