1. A ball is dropped from a height of 225 feet. The ball’s height y (in feet) after t seconds can be modeled by y = 225-16t2 . After how many seconds does the ball hit the ground?
Accepted Solution
A:
we have that y = 225-16t²
we know that the ball hit the ground when y=0 the point when y=0 is the x intercept of the graph so find the value of t for y=0 y=0 y = 225-16t²------> 0=225-16t² 16t²=225-------> t²=225/16----------> t=√(225/16) -----> t=15/4 sec t=3.75 sec