Need help with this question regarding projectile motion. All help will be appreciated.
Gavin is at the golf driving range. He selects a club that will launch the ball with an initial vertical velocity of 43.3m/s to a maximum height of 93.75m. The effects of air resistance can be ignored. Find the time it takes to reach the maximum height.
When I answered it, I knew in terms of vertical motion(given that I take the initial direction of motion i.e when the ball is going upwards as the positive direction):
a=-9.8m/s^2
x=93.75m
u=43.3m/s
v=0m/s
t=?
So technically, you can use either x=ut+1/2at^2 or v=u+at to find the 't' value, as we have 4 pieces of information. However, when I tried both approaches, I got separate answers. What am I doing wrong?