Two particles A and B start at O travel in opposite directions along the circular path at constant speed `v_(A)=0.7 m//s` and `v_(B)=1.5 m//s` respectively. Determine the time when they collide and the magnitude of the acceleration of B just before this happening. `("radius"=5m)`

Explanation

From the condition given in the question, it is clear that total distancen `(=" velocity"xx"time")` will be equal to the circumference of circular path
i.e., `v_(B)t+v_(A)t=` circumference o fcircular path
`1.5t+0.7t=2piR=10pi`
`therefore" Time",t=(10pi)/(2.2)=14.3s`
Acceleration, `a=(v_(B)^(2))/(R)=0.45ms^(-2)`