Find the magnitude & direction of the velocity of heavier fragment relative to da ground just after explosion?

A 10 kg shellis traveling horizontally to the right at 25.0 m/s relative to the ground when it explodes into two fragments, one of m 3.00 kg and the other of m 7.0 kg. The lighter fragment goes directly forward, and the explosion releases 1500 Joules of mechanical energy to the fragments. Find the magnitude and direction of the velocity of the heavier fragment relative to the ground just after the explosion.