A car travels at 75.0 km/hr for 3.00 hours. How many km will it travel?
@agent0smith

Question

A car travels at 75.0 km/hr for 3.00 hours.   How many km will it travel?
@agent0smith

yanasidlinskiy · Answer

This is 25. Correct? I multiplied 75 by 3

agent0smith · Answer

Distance = speed * time

yanasidlinskiy · Answer

A car accelerates from 0.0 to 33 m/s in 6.0 seconds.  What is the magnitude of the acceleration?

agent0smith · Answer

This is 25. Correct? I multiplied 75 by 3

75* 3 isn't 25...

agent0smith · Answer

Acceleration = change in velocity divided by time

yanasidlinskiy · Answer

Sorry meant 225 lol

yanasidlinskiy · Answer

5.5?

agent0smith · Answer

Looks right

yanasidlinskiy · Answer

A runner can run a 400.0 meter lap in 50.0 seconds.   He finishes at the same spot as he began.  What is his average velocity?
I get the formulas confused.

agent0smith · Answer

Average velocity = displacement/time

displacement is change in position... "He finishes at the same spot as he began."

yanasidlinskiy · Answer

I got 8m or unless it's 8m/s

agent0smith · Answer

See my last post. Especially the last line.

yanasidlinskiy · Answer

So 
m right? He started at 400.0m

agent0smith · Answer

Average velocity = displacement/time

displacement is change in position... "He finishes at the same spot as he began."

yanasidlinskiy · Answer

Ok. A car is traveling at 33.0 m/s  when the driver uses the brakes to slow down to 29.0 m/s in 2.50 seconds.   How many meters will it travel during that time?

agent0smith · Answer

You haven't answered the last question yet.

yanasidlinskiy · Answer

it's m/s

agent0smith · Answer

No, you haven't answered it correctly.

yanasidlinskiy · Answer

8m/s

yanasidlinskiy · Answer

He started: A runner can run a 400.0 meter lap in 50.0 seconds

agent0smith · Answer

Read this carefully, and think about what it means:
displacement is change in position... "He finishes at the same spot as he began."

yanasidlinskiy · Answer

It doesn't make sense to me

agent0smith · Answer

Displacement is change in position, ie how far the starting position is, from the finishing position. And, "He finishes at the same spot as he began."

yanasidlinskiy · Answer

Ok well the answer is 8 right?

agent0smith · Answer

No. Displacement is how far you are from where you started. 

"He finishes at the SAME SPOT as he began."

what is his displacement?

yanasidlinskiy · Answer

It's not given which is 0

agent0smith · Answer

"It's not given" does not make something zero.

If something starts and ends at the same point, then what is the change in position? That's the displacement.

sweetburger · Answer

|dw:1465255280827:dw|

sweetburger · Answer

Remember displacement is how far you are from your initial starting position.

nincompoop · Answer

zero