They collide after
Explanation:
The time in which the two cars collide will be equal to the time in which they two cover the distance 'D'.
Let the cars meet after 't' time
Distance covered by toy car travelling at a constant velocity equals
Distance that the accelerating car travles in the same time 't' can be obtained from second equation of kinematics as
Now the condition dictates that
Solving the quadratic equation for 't' we get
We neglect negative value since time cannot be negative.
b) determine if the area is safe
Explanation:
none of the other things she does will matter if the area's not safe, so that should be the first thing she does. i hope this helps! :)