A grasshopper jumps at a 65.0 degree angle at 5.42m/s. At what time does it reach its maximum height?

When the grasshoppers vertical velocity is exactly zero.

v = - g•t + v0.

v: vertical part of velocity. Is zero at maximum height.

g: 9.81

t: time you are looking for

v0: initial vertical velocity

Find the vertical part of the initial velocity, by using the angle at which the grasshopper jumps.