A motorcycle's velocity at the top of the hill is 22 m/s. 4.0 seconds later it reaches the bottom of the hill with a velocity of 30.0 m/s. What is the acceleration of the motorcycle?

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .