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.

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2