Conduct a practical investigation to collect primary data in order to validate the relationships derived

Create a projectile launcher
Launch a projectile at different angles and record the maximum height for every launch angle.
take multiple readings at every launch angle to get avoid random error
Plot a graph of maximum height vs sine of launch angle
It should give a parabolic graph.
Similarly launch projectiles by changing one of the variables and record the dependant variable
Run multiple trials and plot the graph to verify the relationship