A 76 kg window cleaner uses a 9.5 kg ladder that is 6.8 m long. He places one end on the ground 4.4 m from a wall, rests

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A 76 kg window cleaner uses a 9.5 kg ladder
that is 6.8 m long. He places one end on the
ground 4.4 m from a wall, rests the upper end against a
cracked window, and climbs the ladder. He is 5.4 m up
along the ladder when the window breaks. Neglect friction between
the ladder and window and assume that the base of the ladder does
not slip. When the window is on the verge of breaking, what
are (a)the magnitude of the force on the
window from the ladder, (b) the
magnitude of the force on the ladder from the ground,
and (c) the angle (relative to the
horizontal) of that force on the ladder?