Question

A student standing on the ground throws a ball straight up, 2 metres above the ground, with an initial speed of 15m/s.How long does the ball take before hitting the ground?

Answer 1

Which kinematics do you know that might apply?

Answer 2

(hint: you only need 1 if you choose correctly!)

Answer 3

@alltehmaffs v = u + at , where u is initial velocity

Answer 4

That can give you the velocity at any point in the trajectory, which you can use, but can you think of one that describes how it moves (ie, measures its displacement)?

Answer 5

(hint: it's the formula for displacement, and uses initial velocity, time, and acceleration)

Answer 6

@MERTICH ? ^_^