<h3><u>Answer;</u></h3>
a) 178.6125 Joules
b) Work done does not depend on constant speed or acceleration up the ladder
<h3><u>Explanation</u>;</h3>
Work done =Fd times the cosine of angle between;
where F is force d is distance m is the mass a is acceleration
.F=ma. In this case a=g=9.81 m/s^2 and cos 30=0.866
Therefore;
W= 75 × 9.81 × 2.75 × .866
= 178.6125 Joules
b. The work done by the painter does not depend on whether the painter climbs at constant speed or accelerates up the ladder.
W=3376.945 Joules
Places with continental climates typically have hot summers and cold winters. As compared to places with mild climates, places with continental climates tend to experience the two extremes when it comes to the seasons. Summers can get very hot, and winters can get very cold.
Kinetic energy = (1/2)*mass*velocity^2
KE = (1/2)mv^2
KE = (1/2)(478)(15)^2
KE = 53775J
