I'm taking highschool physics right now, and we're doing kinematics in one dimension.(adsbygoogle = window.adsbygoogle || []).push({});

Well I've been stuck on this word problem for days and stumbled accross this

forum on a google search.

Thought maybe you could help. Anyway it is:

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Two soccer players start from rest, 48m apart. They run directly toward each other, both players accelerating. The first player has an acceleration whose magnitude is 0.50 m/s^2. The second player's acceleration has a magnitude of 0.30 m/s^2.

(a) How much time passes before they collide?

(b)At the instant they collide, how far has the first player run?

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I've tried to tackle this as any other algebra distance=rate*time problem (but with some physics equation involved)

I attempted to get the final velocity of both runners by using the equation

Vf^2=vi^2+at

where vf=final velocity and vi=intitial.

I used '48m' as the value for distance when I did this

Then when I get my final velocity I'd figure out the average velocity for both runners.

Then tackle the problem by adding their individual rate*time together to get rt(of the first guy)+rt(second guy)=48m ,Attempting to get the time they collide from that.

BUT, apparently by plugging in 48m in the physics equation gave me a bad final velocity, therefore a bad time.

I know the correct answer for part a is 11 seconds, but don't know how it's obtained. Please I would be greatful if anyone could help.

I'll also try to clear this up if anyone's confused.

Thanks.

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# Homework Help: Acceleration word problem help!

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