Select the correct answer. what did galileo discover when he dropped two cannon balls of different weights from the leaning tower of pisa? a. the force acting on both of the balls was the same. b. the time for both of the balls to reach the ground was the same. c. a mass-dependent attractive force was exerted by earth on the two balls. d. gravity pulls everything downward. e. the balls exerted an attractive force between each other as they fell.

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?

Specific heat refers to the amount of heat required to change 1 gram of a substance by degree(s) celsius

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?