A buried IED (improvised explosive device) goes off. 10 kg of metal flies north at 4 m / s. 100 kg of metal flies east at 2 m / s. 5 kg of metal flies south at 8 m / s, and, 1 kg of metal flies west at 200 m / s. The total momentum after the explosion is kg m / s.

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?