A lampshade whose top PQRS and bottom VUWX are 12 and 20cm respectively. If the vertical depth is 14cm, calculate to the nearest whole number.

A). The area of the material used in making the lampshade

B). The volume of the pyramid of which the lampshade is a part.

Hint: The lamp shade is a square based trapezium.

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).