Solve the following problem:
Problem: Jonathan and Jane are sitting in a sleigh that is at rest on frictionless ice. Jonathan's weight is 800 N, Jane's weight is 600 N, and that of the sleigh is 1000 N. They see a poisonous spider on the floor of the sleigh and immediately jump off. Jonathan jumps to the left with a velocity of 4.00 m/s at 26.0° above the horizontal (relative to the ice), and Jane jumps to the right at 5.00 m/s at 35.2° above the horizontal (relative to the ice).
Part A: Calculate the sleigh's horizontal velocity?
I need help to calculate the sleigh's horizontal velocity.