A stationary Hot Wheels toy car on top of a ramp has a total of 0.15 J of gravitational potential energy and 0 J of kinetic energy. Assuming there is no loss of heat energy due
to friction, how much kinetic energy will the car have when it reaches the bottom of the
ramp?
o cannot calculate kinetic energy without the mass and velocity of the car
O 0.10 )
0.15)
OJ

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?