A ball is thrown straight upward and returns
to the thrower’s hand after 2.39 s in the air.
A second ball is thrown at an angle of 35.0
◦
with the horizontal.
At what speed must the second ball be
thrown so that it reaches the same height as
the one thrown vertically? The acceleration
of gravity is 9.81 m/s
2
.
Answer in units of m/s.