At a given instant the bottom a of the ladder has an acceleration aa = 4 ft>s2 and velocity va = 6 ft>s, both acting to the left. determine the acceleration of the top of the ladder, b, and the ladder's angular acceleration at this same instant.

Velocity=total displacement/timefrom house to store is 500 from store to neighbor is 200 therefore total displacement=500+200=700metrestherefore,700metres/910seconds=0.8metres per second

Answer;

hot magma rises and pushes up toward the lithosphere, and as it cools it cycles back down toward the core to be heated again.

explanation; convection currents are the circular pathways taken by a fluid that enhances heat transfer by the process known as convection which occurs in fluids.convection currents transfer heat from one place to another by mass motion of a fluid. earth mantle is in a semi-liquid state and behaves like any other fluid, rising up from the bottom of the mantle after becoming hotter and less dense from heat of the earth's core, as the rock loses heat into the earth's crust it becomes cooler and more dense, then sinking back down to the core, then repeating the cycle.

Average net force: ∑f = fapp + fgrav = 8.20 + (-9.81m/s²)(0.500 kg)           = 3.295 n          = 3.30 nvelocity of object∑f = maa = ∑f / m = 3.295 n / 0.500 kg = 6.59 m/s²v² = v₀² + 2adv = √(v₀² + 2ad)v = √[ 0² + 2(6.59m/s²)(1.50m) ]v = 4.45 m/s