A 2 kg object is moving west at 4 m/s. It takes 2.0 s to slow down to 2 m/s, still moving west. What is the change in momentum, ΔP, of the object?

a. 4.0 kg∙m/s, west

b. 4.0 kg∙m/s, east

c. 2.0 kg∙m/s, west

d. 2.0 kg∙m/s, east

A long stairway with a metal handrail runs between the houses of Amelia and her friend Michelle. After getting their parents' permission, the two girls often play near the stairs.

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A force of 100 newtons is applied to a box at an angle of 36º with the horizontal. If the mass of the box is 25 kilograms, what is the horizontal acceleration of the box?

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To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. in one such episode, a 600 g falcon flying at 20.0 m/s ran into a 1.50 kg raven flying at 9.00 m/s.