Take the derivative of y with respect to t to find WHEN the object reaches max ht.
after that plug in t+1 for t to find where it reaches in ht.
So in the above eqn, y is max when dy/dt=0
dy/dt = -16(2)(t-3) + 0 = 0 ==> t = 3
no substitute t = 4 in above eqn to get -16(1) + 150 = 134.
Whats the Official Answer?
So answer should be C - 135
Sorry C: 134
(my fingers are too stubby for this mac keyboard)