A Test Rocket Is Fired Straight Up from Rest with a Net

question 45

Multiple Choice

A test rocket is fired straight up from rest with a net acceleration of 20 m/s².After 4 seconds the motor turns off,but the rocket continues to coast upward.What maximum elevation does the rocket reach?

• A)487 m
• B)327 m
• C)320 m
• D)408 m
• E)160 m

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