1) A particle is moved along the x-axis by a force that measures 8/(3 + x)² pounds at a point x feet from the origin. Find the work W done in moving the particle from the origin to a distance of 9 ft.

W=. ft-lb

2)A force of 20 lb is required to hold a spring stretched 8 in. beyond its natural length. How much work W is done in stretching it from its natural length to 14 in. beyond its natural length?

W= ft-lb