1. A boyfriend throws a message in the form of a ball, with a speed whose horizontal component is 3 m/s and whose vertical component is 10 m/s, so that his girlfriend receives it without difficulty, that is, without vertical speed. Calculate:

a) The initial speed with which the message was launched.

b) The launch angle.

c) The height of the bride's balcony.

d) The horizontal distance of the groom, at the foot of the balcony.