• Support PF! Buy your school textbooks, materials and every day products Here!

Physics virgin is this how I do it?

  • Thread starter noodle21
  • Start date

noodle21

A truck on a straight road starts from rest accelerating at 2.0 m/s2 until it reaches a speed of 20 m/s. Then the truck travels for 20 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.0 s. (a) How long is the truck in motion? (b) What is the average velocity of the truck for the motion described?

My answers: (a) From rest to speed of 20 m/s it takes 10 s. Add 20 s. Add 5.0 s.... equals 35 s.

(b) I know average velocity is displacement divided by time. But, how do I calculate the displacement???
 
1,037
1
Calculate the displacements from the 3 segments of the trip separately. I assume you've come across a formula to calculate the distance traveled during constant acceleration...
 

Related Threads for: Physics virgin is this how I do it?

  • Last Post
Replies
1
Views
2K
Replies
2
Views
16K
Top