# Two particles A and B start at O and travel in opposite direction along the circular path at constant speed #V_a = 0.7m/s# and #V_b = 1.5m/s# respectively. Determine the time when they collide(radius = 5m)?

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Steve J.
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Feb 9, 2018

#### Answer:

They collide after about 10 s.

#### Explanation:

The circumference of the circle is

Let the time between start and collision be t. Then we know that

Substituting into the first equation

So, rounding that to 1 significant digit (because radius is 5 m), they collide after about 10 s.

I hope this helps,

Steve

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