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Im a real dummy to physics! Help with questions please!

  • Thread starter Dj_Physics
  • Start date
  • #1
A car starts from rest and accelerates to a speed of 72 km/h in 5 seconds. Assuming uniform acceleration, what is the acceleration in meters per second squared?

A ball is thrown straight up witha speed of 36 m/s. How long does it take to return to its starting point?

Barbara travels 20 km Northward, then travels 40 km Eastward, then continues for 50 km in a Southward direction. What displacement will now take her back to her initial position?
 

Answers and Replies

  • #2
551
1
Do you know any basic kinematic equations?
 
  • #3
No, not without the book. I'm not good in physics at all....
 
  • #4
Tom Mattson
Staff Emeritus
Science Advisor
Gold Member
5,500
7
OK, so use the book until you've learned them.

We have a policy here, which is posted at the top of the Homework section of PF. It states that you have to make an attempt at your problems and show your work in order to receive help.

So let's have it! :biggrin:
 

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