Problem: Three people pull simultaneously on a stubborn donkey. Jack pulls eastward with a force of 64.7 N, Jill pulls with 95.5 N in the northeast direction, and Jane pulls to the southeast with 157 N. (Since the donkey is involved with such uncoordinated people, who can blame it for being stubborn).
Part A: Find the magnitude of the net force the people exert on the donkey.
I don't know how to get that answer for the above problem. Please help! Thanks.