How Far Will a Puck Slide with Friction?

[Anuj Agarwal]

Homework Statement

A force of friction of 3.2N acts on a 1.1Kg puck while it is sliding along a horizontal surface. If the initial velocity of the puck was 7.5 m/s, how far will the puck travel before coming to rest?

Homework Equations

The Attempt at a Solution

The answer is 9.7M. Tried multiple time with different formulas but unable to derive at solution.

 

[gneill]

Hi @Anuj Agarwal, Welcome to Physics Forums.

You need to show us at least one of your attempts in detail or your thread will be deleted. Just saying you tried and failed does not give us any basis upon which to help you.

 

[Anuj Agarwal]

Sorry. Here is my try: F =mxa hence a = f/m=3.2/1.1=2.9
A=v/s, hence s=v/a =7.5/2.9=2.58
Distance = velocityxtime = 7.5x2.58=19.3 m

 

[Jilang]

The last line is wrong. This would only be true if the velocity were constant. The fact that your answer is twice as big as it should be should give you a clue.