physics

The angle of projection can be calculated using the equation:

theta = arctan(v0y / v0x)

Where v0x is the initial x-velocity and v0y is the initial y-velocity.

Since the ball was thrown with a speed of 100m/s, v0x = 100m/s. The vertical component of the initial velocity, v0y, can be calculated using the equation:

v0y = sqrt(v0^2 - vx^2)

Where v0 is the initial velocity and vx is the horizontal component of the initial velocity.

v0y = sqrt(10000 - 100^2)
= sqrt(9800)
= 99.0 m/s

Therefore, the angle of projection is:

theta = arctan(99 / 100)
= 44.9 degrees