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LoveHOPEpeace

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## Homework Statement

A 4.9-N hammer head is stopped from an initial downward velocity of 3.2 m/s in a distance of 0.45 cm by a nail in a pine board. In addition to its weight, there is a 15-N downward force on the hammer head applied by the person using the hammer. Assume that the acceleration of the hammer head is constant while it is in contact with the nail and moving downward.

## Homework Equations

F=ma

kinematics

## The Attempt at a Solution

I know a few things...that the nail can be acting on the hammer with a normal force of 4.9N, the hammer is acting on the nail with a force of 15N, and the nail weighs 4.9N. There is most likely a constant acceleration of "a" acting on the system since we have a velocity and such...but when I solved for "a" with the given information with the equation of v^2 =(v_0)^2 +2a(x-x0) I got 1138m/s^2. I'm about 99% sure that is wrong. lol Please, help me wrap my head around some of the conceptual things. I get basic forces, but when it comes to difficult problems like this I'm lost as heck. Thanks!