Answer:
Step-by-step explanation:
Along with the angle of elevation, the initial velocity of the ball will determine how far and how high it goes.
Also, the initial height that the ball is hit from, as well as the horizontal distance from the fence, will affect whether the ball clears the fence.
There's also the acceleration of gravity, but here on Earth, that doesn't change much near the surface.
It takes her (100 mi)/(50 mi/h) = 2 h to get to her destination. She has 1 h 40 min = 100 min for her 100 mi return trip.
.. (100 mi)/(100 min) = (60 mi)/(60 min) = 60 mi/h
She must return at the rate of 60 mph to complete the trip in 3 h 40 min.