Helen is driving her car if the kinetic energy of the car is 8.10 e4 j and the mass of the car and its contents is 1010 kg helen is driving at a speed of
1.26 m/s
9.01 m/s
12.0m/s
12.6m/s
81.1m/s

Afigure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 20.9 12000 200 3.33

Hydrogen and helium are both members of?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)