a. Two hockey players heading in opposite directions on the rink collide, one with a body mass of 85 kg traveling at 4 m/s one way, and the other with a body mass of 75 kg traveling at 2.50 m/s in the opposite way. If the two players stick together and travel in the direction of the more massive player, what is their combined velocity after the collision?

b. In your car gently reversing, you collide with a curb for 0.50 s, reducing your momentum from 2,030 kg m/s to zero, what was the force of the curb on the car in N (put in the magnitude of the force, a positive number) to two significant digits?

c. Bored by a pool, you notice a child's plastic toy is a cube shaped 10 cm wide by 10 cm long by 10 cm high. The side is marked into 10 increments. You want to determine if you'll be able to make a raft of this and other plastic toy cubes on hand. Wading into the pool with this plastic block, you find that 9.5 centimeters of the block stay submerged while the block is floating in water? If the pool water has a density of 993 kg/m³, what is thedensityof this plastic in kg/m³totwosignificant digits?