An object that changes its momentum must ??? a. apply a greater momentum on a second object?

b. violate conservation of momentum?

c. have an impulse applied to it?

Describe uniform velocity and variable velocity in short

Tall pacific coast redwood trees can reach heights of about 100 m. if air drag is negligibly small, how fast is a sequola cone moving when it reaches the ground f it dropped from the top of a 100 m tree?

It is really hard for me right know