You do 214.9 Joules of work against gravity when lifting your backpack up a flight of stairs that is 6.2 meters tall. What is the weight of your backpack in Newtons?
Work (J)= Force (N) x Distance (m)
214.9 = Force x 6.2
so Force (weight of backpack) = 214.9/6.2 Newtons
$${\mathtt{Force}} = {\frac{{\mathtt{214.9}}}{{\mathtt{6.2}}}} = {\mathtt{Force}} = {\mathtt{34.661\: \!290\: \!322\: \!580\: \!645\: \!2}}$$ Newtons
