Question

A marble was thrown upward at an angle of elevation of 30o

. It travelled 1.2s to reach the 

highest elevation. Find its initial velocity, Vo.

Answer 1

$$T=\frac{v_0\sin{30}}{g}\\1.2=\frac{v_0\sin{30}}{9.8}\\v_0=23.5\frac{m}{s}$$