What is the minimum work needed to push a 850 -kg car 750 m up along a 9.5 ∘ incline? Ignore friction. Express your answer to two significant figures and include the appropriate units.

Question

What is the minimum work needed to push a 850 -kgkg car 750 mm up along a 9.5 ∘∘ incline? Ignore friction.

Express your answer to two significant figures and include the appropriate units.

Answer 1

If it is frictionless we only need to determine the work done against gravity =mgh

We can calculate h by using trig h=750 * sin(9.5) = 123.8 meters

Therefore work = 850 * 9.8 * 123.8 = 1.031 Million Joules

With two sig figs it is 1.0 x 10^6 Joules