A math 1100 student with awesome enthusiam to do mathematics decided to toss their math 1100 book up into the air with joy. Knowing that the student projected

Question

knowing that the student projected the textbook at a velocity of 80mph, when will the book hit the ground? Hint: h=80t-16t^2. also when will the book reach its maximum height? How high up is the book at its maximum height?

Answer 1

hits ground in 5 seconds

reaches max height = 100 feet, in 2.5 seconds

that's probably the answer they want, but it's wrong due to inconsistent measurement units

the formula is for feet and seconds

the above answer is right if initial velocity was 80 ft/sec, but you have 80 mph which seems most unlikely

so, either 100 ft in 2.5 seconds or 100 miles in 2.5 hours

but -16x^2 is the term for gravity in ft/sec^2