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Raindrops fall vertically at 4.5 m/s relative to the earth. What does an observer in a...

Raindrops fall vertically at 4.5 m/s relative to the earth. What does an observer in a car moving at 22.0 m/s in a straight line along East measure as the velocity of the raindrops? Give the magnitude and direction of that velocity

A rocket-sled with six rockets has a mass of 2.10 x 103 kg and decelerates at a rate of 196 m/s2.

a. What force is necessary to produce this deceleration?

b. If the rocket-sled starts with only one rocket burning, what is the magnitude of this acceleration? Assume the thrust is 2.40 x 104 N and the force of friction opposing the motion is 650.0 N.

c. Why is the acceleration not one-sixth of what it is with all rockets burning?

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