Question

please help me please please please please please please please please please please please

Answer 1

S = distance = 1/2 *g*t²

19.6 = 1/2*9.8*t²

⇒ t = 2 s

Now to find initial velocity;

time = 2usinФ/g

⇒u = 9.8 m/s    (since sinФ = 90 degree)