A5.00 kilogram block slides along a horizontal, frictionless surface at 10.0 meters per second. for 4.00 seconds. the magnitude of the blocks momentum is ?
a)200 kg m/s
b)50.0 kg m/s
c)20.0 kg m/s
d)12.5 kg m/s

Two cannon balls weighing 18 kg and 24 kg are chained together and fired horizontally with a velocity of 165 m/s from the top of a 21-m wall. the chain breaks during the flight of the cannonballs and the 18-kg cannonball strikes the ground at t = 1.5 s, at a distance of 240 m from the foot of the wall, and 7 m to the right of the line of fire. determine the position of the other cannonball at that instant. neglect the resistance of the air.