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)?
They collide after about 10 s.
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,