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Answer 1 · 2016-04-03T12:56:06

#30"m/s"#

The vertical component of the ball's velocity is #vsin30#.

Use this equation of motion:

#v^2=u^2+2as#

This becomes:

#0=(vsin30)^2-2xx9.8xx11.5#

#:.(vsin30)^2=225.4#

#vsin30=15.01#

#v=15.01/0.5=30.02"m/s"#