Question

Help me check projectil

Answer 1

http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Mathematics%20%289709%29/9709_w11_qp_51.pdf

Question 2:
At P, t=0.6s
g=10
\[u_x=ucos(60)~~~~~~~~~~~~~~~~~u_x=\frac{x}{t}\]
\[u_y=usin(60)~~~~~~~~~~~~~~~~~usin(60)t=x\]
************************************************************
\[h=usin(60)t+\frac{1}{2}(-10)t^2\]
\[h=\frac{3\sqrt{3}}{10}u-\frac{9}{5}\]
From triangle,
\[\tan(45)=\frac{h}{x}\]
\[u(\tan(45))(\sin(60))t=\frac{3\sqrt{3}}{10}u-\frac{9}{5}\]
\[\frac{3\sqrt{3}}{10}u=\frac{3\sqrt{3}}{10}u-\frac{9}{5}\]
hmm

Answer 2

In the last but one step, x should be substituted as \[u(cos(60).\]Instead, you have substituted it as \[u(sin(60).\]