A 4.0 kg object in deep space moves at a constant velocity of 10sm along the +x axis. The object suddenly explodes into 2 equal mass pieces. Immediately after the explosion, one piece is now moving directly along the –y axis with a speed of 8.0sm. What was the size of the impulse (in proper MKS units) provided to this piece now moving along the –y axis from the explosion?
(A) 12.8 (B) 16.0 (C) 25.6 (D) 36.0 (E) 43.1