Question

A particle is thrown upwards such that it reaches the maximum height in 3 s. the initial speed of projection may be (g = 10 ms–2)

Answer 1

initial velocity =u
final velocity = 0
acceleration = -10 m/s^2
t = ?

v = u + at
0 = u + (-10)×3
0 = u - 30
u = 30 m/s

Initial speed of projection is 30 m/s