Kinematics Problems

  • Thread starter PandaBunny
  • Start date
  • #1
I don't know what to do for these three questions and they're due on Wednesday

Homework Statement


a. A sprinter can accelerate with constant acceleration for 2.28s before reaching top speed.
He can run 148.0m in 16.6s. What is his speed as he crosses the finish line?

b. A car accelerates at 2.15m/s2 along a straight road.
It passes two marks that are 29.5m apart at times t=3.95s and t=4.85s.
What was the car's velocity at t=0?

c. You've attached a rocket to the rear of a small car
The rocket provides a constant acceleration for 4.68s.
As the rocket shuts off, a parachute opens and slows the car at a rate of 3.43m/s2.
The car passes the judges' box, 878.0m from the starting line, exactly 14.0s after you fire the What is the car's speed as it passes the judges?

Homework Equations





The Attempt at a Solution



I don't even know where to start I'm just too stressed
 

Answers and Replies

  • #2
SteamKing
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Chill and start by recalling what equations govern accelerated motion.

It is also suggested that you post one problem at a time.
 
  • #3
Ibix
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First, Don't panic! Second, somebody on here quoted a problem-solving methodology I didn't know - GRASP. It stands for

Given - list the quantities that are in the question.
Required - list the quantities that you are supposed to find.
Asess - what equations do you know that link the things that you listed? Your textbook's index is helpful if nothing springs to mind.
Solve - do the maths.
Paraphrase - write out the answer.

See if you can do the first three at least.
 
  • #4
I've tried to solve it already but I'm just not getting the right answers, I just need to see how someone else goes about solving it before I try it again
 
  • #5
SteamKing
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If you want help, post your work so far. We won't do your HW for you. You don't have much time left.
 

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