The mass of hotweels car is 10.0 grams, and it’s volume is 2.0 ml. What is the density of the toy car

Can somebody explain to me how newton's 3rd law relates to momentum? ~ap physics 1

In what direction does the medium move relative to the direction of the wave? explain.

Ahot-air balloonist, rising vertically with a constant speed of 5.00 m/s releases a sandbag at the instant the balloon is 40.0 m above the ground. after it is released, the sandbag encounters no appreciable air drag. compute the velocity of the sandbag at 0.250 s after its release.