A projectile is launched from the top of a building with an initial velocity of 30 m/s at an angle of 60° above the horizontal. The magnitude of its velocity at t = 5 s after the launch is
a) −23.0 m/s
b) 7.3 m/s
c) 15.0 m/s
d) 27.5 m/s
e) 50.4 m/s
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