A projectile's horizontal range on level ground is R= [(Vo)^2 sin2θ] / g. At what launch angle or angles will the projectile land at half of its maximum possible range.

15° and 75°

Explanation:

Given:

The range of a projectile motion is given as:

Where,

Maximum possible range is when

So, maximum range possible is,

Now, as per question:

Therefore, the launch angles are 15 degree and 75 degree.

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.