Collision theory to explain reaction rate

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Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation