The illustration shows the collision of two objects on a frictionless surface. 10 kg
10 kg
20 kg
25
?
What is the velocity of the two connected objects after the collision?

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?

Which wave is the result of amplification and produces a louder sound

Which of the following is tru about semi-conductors