Answer:
81 units
Step-by-step explanation:
Given data
We are given the function for the height, the height is a function of time t
h=-16t^2+75t
Hence for t= 3 , let us substitute and find the height h
h=-16(3)^2+75(3)
h= -16*9+ 225
h= -144+ 225
h= 81
Hence the height at 3 seconds is 81 units
