Projectile Motion (cannonball)
A cannonball is fired with an initial speed of 90.0 m/s at an angle 61.0 ° above the horizontal (see diagram). The cannonball strikes point A on top of a cliff 10.0 s seconds after being fired. Ignore air resistance in this problem.
Calculate the speed of the cannonball just before it hits A.
The things I have calculated previously are:
· Point A is 436 meters horizontally from the cannon.
· The maximum height the cannonball reaches is 316.
· The cliff is 297 m high.
Now in order to calculate the speed of the ball before it hits the A, I tried to use the formula but I do not end up with the correct answer (which is 47.7). I heard that this formula only works for finding the vertical component of the speed of the cannonball. So what do I need to do??
I even tried using to find the vertical speed and v=xt for the horizontal speed and then add up the two speeds to find the resultant. But this didn't work either... :(