A car is moving at 15 m/s when the speed limit changes to 22 m/s. The car has a motor capable of 3.58 m/s2 acceleration. How long does the acceleration last?

Ahole in the ground in the shape of an inverted cone is 14 meters deep and has radius at the top of 11 meters. the cone is filled to the top with sawdust. the density of the sawdust depends upon the depth, x, following the formula ρ ( x ) = 2.5 + 1.2 e − 0.7 x kg/m3. find the total mass of sawdust in the conical hole.