How Do You Calculate Impact Duration and Average Force in Momentum Problems?

[UmarRules2000]

A .450 kg arm moves horizontally at 7.00 m/s when it strikes a wall and comesto rest after driving the wall 1.00 cm. Calculate the duration of the impact. What was the average force exerted on the nail?

Delta P = F delta T
F delta t = m delta v
F=ma

I know the momentum would be .315 kgm/s, but I'm not sure how to calculate the rest.

 

[Doc Al]

Hint: Assume that the acceleration is constant during the impact.

 

[Naty1]

I know the momentum would be .315 kgm/s, but I'm not sure how to calculate the rest.

check that decimal point!

 

[Doc Al]

check that decimal point!

Yeah, that too!

 

[rude man]

What does the impulse integral say?