Question

A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30 m/s^2

A rocket blasts off vertically from rest on the launch pad with an upward acceleration of 2.30 m/s^2. At 10.0 s after blastoff, the engines suddenly fail, which means that the force they produce instantly stops.

How high above the launch pad will the rocket eventually go?

got it….142 m

Find the rocket's velocity at its highest point.

got it….0 m/s

Find the magnitude of the rocket's acceleration at its highest point.

got it….9.8 m/s^2

Find the direction of the rocket's acceleration at its highest point.

got it….downward

How long after it was launched will the rocket fall back to the launch pad?

got it….17.7 s

How fast will it be moving when it does so?

AHHHH!!!! I don't know….

At the top, it has no KEnergy, only PEnergy. So at the bottom, the PEnergy is converted to Kenergy.

mgh= 1/2 mv^2.

The other way..

v= sqrt(2gh) from kinetics.

Solutions

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