# Go Rudolph Go!

Eight reindeer, each with mass of $$400~\mbox{kg}$$, are attached to Santa's sleigh in four rows of two reindeer each. The last two reindeer, Donner and Blitzen, are attached to the reindeer in front of them and Santa's sleigh, with total mass $$1200~\mbox{kg}$$, behind them by their harnesses. On liftoff on Christmas Eve, the reindeer accelerate straight up from the North Pole at $$5~\mbox{m/s}^2$$. What is the force in Newtons the harness exerts on Santa's sleigh during sleigh liftoff?

Details and assumptions

• The acceleration of gravity is $$-9.8~\mbox{m/s}^2$$.
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