Answer to Question #205703 in Classical Mechanics for Mubarak idris

Question

15. A body projected upward from the level ground at certain angle, if the total time taken is 6.3sec with an initial velocity of 40m/s. Find (i) (ii) (iii) (iv) The angle of projection How far from the starting point will it strike the ground How height will it go  Max. Range  

Answer 1

1)

$\alpha=\arcsin \frac{gt}{2v}=50.5°,$

2)

$l=\frac{v^2\sin 2\alpha}{g}=153~m,$

3)

$h=\frac{v^2\sin^2\alpha}{2g}=49~m,$

4)

$s=l=153~m.$