Find minimum stopping distance

  • #1
47
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Homework Statement



A crate is being transported on a flatbed truck. The coefficient of static friction between the crate and the bed is 0.470. What is the minimum stopping distance if the truck, traveling at 70 km/h, is to decelerate uniformly and the crate is not to slide forward on the bed?

Homework Equations



F=ma
Vi^2 - Vo^2 = 2ad

The Attempt at a Solution


I found the acceleration ,
Fnet=ma
Us•mg=ma (The mass basically cancels out here)
Us•g = a
4.606 = a


To find the distance, I figured to use Vi^2 - Vo^2 = 2ad , due to not having time . However , how do you find the final velocity of the initial velocity is 70 km/h .
I’m stumped here
 

Answers and Replies

  • #2
jbriggs444
Science Advisor
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However , how do you find the final velocity of the initial velocity is 70 km/h .
I’m stumped here
You want to know the final velocity of a truck that is coming to a stop?
 
  • #3
47
0
You want to know the final velocity of a truck that is coming to a stop?
I tried that but it doesn’t get me the right answer
 
  • #4
47
0
You want to know the final velocity of a truck that is coming to a stop?
Never Mind, you’re right .
I did a mistake in my calculations
Thanks !
 

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