I dont get this someone please explain how the answer is 0.87 secs

Explanation:

split the situation into two parts

part one - from initial starting point to top of parabola

part two - top of parabola to impact on ground

* v(0) is initial speed

* t(1) is time for part one (from initial start to top)

* y is distance from starting point to the top

* t(2) is time for part 2 (from top to impact)

t(total) =.88 (if you rounded earlier in the problem you would get .87

tube or goog will be great resources to find the answer to the question that you're asking

newton's first law of motion