A 1500 kg weather rocket accelerates upward at 10m/s2. It explodes 1.8 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 510 m .

What was the speed of the heavier fragment just after the explosion?
Express your answer using two significant figures.

What was the direction of the heavier fragment just after the explosion?
1. upward OR
2. downward