Question 1. A 13 metre plank is resting against the wall. The bottom is initially 12 metres away from the wall. We
push the bottom of the plank towards the wall at a rate of 1 4 m/s.
(a) How far is the bottom of the plank from the wall 28 seconds after we start pushing?
(b) How fast is the top of the plank moving up the wall 28 seconds after we start pushing?
Question 2. Does f(x) = x2*e^(-x) have global minimum or maximum ?
(a) So, ans= 5m (b) So, the top of plank moving up the wall at the rate of = 0.104 m/s Q.2>. It has... View the full answer