A 1 g object traveling at 10 m/s collides with a stationary 100 g object at rest and bounces back at the same speed. Assuming conservation of momentum, what is the speed of the 100 g object after the collision?​

m vi = initial momentum

m vf + M V  = final momentum

M V = m (vi - vf)      combining equations

V = m / M (vi - vf)

Let vf = 10 m/s and  vi = -10 m/s

Then V = 1/100 * (-20 m/s) = -.2 m/s

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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