Imagine a ball fired from a height of 2.0 m at 3.0 m/s, and at 45° above horizontal. if the ball lands on horizontal ground, where does it do so?

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

If the pressure in a gas is doubled while its volume is held constant. true or false

How does changing the frequency affect the energy of the wave?