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A 1400 kg weather rocket accelerates upward at 10m/s2. It explodes 1.5 s after liftoff and...

A 1400 kg weather rocket accelerates upward at 10m/s2. It explodes 1.5 s after liftoff and breaks into two fragments, one twice as massive as the other. Photos reveal that the lighter fragment traveled straight up and reached a maximum height of 500 m .

What was the speed of the heavier fragment just after the explosion?

Express your answer using two significant figures.

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