QUESTION 2 2.1 Two boys, each of mass m, are standing at the back of a flatbed trolley of mass
4 m. The trolley is at rest on a frictionless horizontal surface.
The boys jump off simultaneously at one end of the trolley with a horizontal
velocity of 2 m-s-1. The trolley moves in the opposite direction
2.1.2 Calculate the final velocity of the trolley. [1m-s ']
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True or false: the revolution of the earth creates day and night as it rotates around the sun

Boxing gloves are padded to lessen the force of a blow. (a) calculate the force exerted by a boxing glove on an opponent’s face, if the glove and face compress 7.50 cm during a blow in which the 7.00-kg arm and glove are brought to rest from an initial speed of 10.0 m/s. (b) calculate the force exerted by an identical blow in the gory old days when no gloves were used and the knuckles and face would compress only 2.00 cm. (c) discuss the magnitude of the force with glove on. does it seem high enough to cause damage even though it is lower than the force with no glove?

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •