2) the horizontal and vertical components of the initial velocity of a football are 16 m/s and 20 m/s respectively. how long does it take for the football to rise to the highest point of its trajectory?

2.04 s

Explanation:

Let the initial velocity be v, Angle of projectile be

Then the horizontal component = v cos θ = 16 m/s

Vertical component of velocity = v sin θ = 20 m/s

Time taken to reach the highest point is half the time taken for total flight.

Time for total flight,

Thus, the football takes 2.04 s to rise to the highest point of its trajectory.