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M1 Vectors Question please help!

I have attached the question:

Screen Shot 2013-04-06 at 22.08.25.png

I can do each question apart from d.

Answers to each (may help?)
a. 9.43ms^-1
b. (2+5t)i + (1+8t)j
c. 1.6s

for d, I have subbed in 1.6s to find the position vector of the ball, to get
10i + 13.8j

I know I need to find the distance of the second runner, however I don't know how to do this?

Any help would be greatly appreciated!
Reply 1
Avatar for fayled
fayled
9
Original post by L1000
I have attached the question:

Screen Shot 2013-04-06 at 22.08.25.png

I can do each question apart from d.

Answers to each (may help?)
a. 9.43ms^-1
b. (2+5t)i + (1+8t)j
c. 1.6s

for d, I have subbed in 1.6s to find the position vector of the ball, to get
10i + 13.8j

I know I need to find the distance of the second runner, however I don't know how to do this?

Any help would be greatly appreciated!


The question tells you where the player starts running from (point B) and you have worked out where he finishes above.

So you can find his displacement from that.

This is consistent with the fact the player is running due north, as his velocity has no i component.
(edited 11 years ago)
Reply 2
Avatar for L1000
L1000
OP
7
Original post by fayled
The question tells you where the player starts running from (point B) and you have worked out where he finishes above.

So you can find his displacement from that.


Sorry that was really stupid, thank you for your help :smile:

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