You apply 10N of force to three boxes. Each has the same size and is made of the same material, but they all have different masses. Which box will have the greatest acceleration?

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

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

What are two different ways you could find the value of a? explain these methods.