write the difference between the fall of a parachute on the earth and its fall on the moon? On what condition does a body have free fall..?

The gravity of earth and moon are different and it will effect the fall. So the parachute will fall six times less on moon than earth because gravity of moon is 6 times less than earth. If the parachute is under freefall, then the acceleration of the parachute will be equal to acceleration due to gravity.

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nah.   i'm just sleepy.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me