Im a real dummy to physics Help with questions please

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In summary, the conversation covers topics such as acceleration, displacement, and kinematic equations in physics. A car with uniform acceleration reaches a speed of 72 km/h in 5 seconds. The acceleration in meters per second squared is unknown. A ball is thrown straight up with a speed of 36 m/s and the question is how long it takes to return to its starting point. Barbara travels in different directions and the question is what displacement will take her back to her initial position. The conversation also mentions a policy of showing work and making an attempt at problems in order to receive help.
  • #1
Dj_Physics
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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?
 
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  • #2
Do you know any basic kinematic equations?
 
  • #3
No, not without the book. I'm not good in physics at all...
 
  • #4
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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Physics is the branch of science that deals with the study of matter, energy, space, and time, and how they interact with each other.

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