Question

answer this question with process​

Answer 1

Explanation:

Here,

Initial velocity, u = 40 m/s

Final velocity, v = 0 m/s [ Since it will stop when it reaches its highest point]

Acceleration, a = - 9.8 m/s^2 [ Since Force of gravity is opposite to direction of motion]

Displacement, s = 40 m

Now,

We know that

v = u + at

0 = 40 - 9.8 ×t

t = 40 / 9.8

t = 4.08 s ( approx.)