a) A place kicker must kick a football from a point 34 m (about 37 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 21 m/s at an angle of 51◦ to the horizontal. By how much does the ball clear or fall short of clearing the crossbar? The acceleration of gravity is 9.8 m/s^2. Answer in units of m.

b) To determine if the ball approaches the crossbar while still rising or while falling, what is its vertical velocity at the crossbar? Answer in units of m/s.

I kindly ask for some help, mainly in part b, thanks!