The "spring-flex" exercise system consists of a spring with one end fixed and a handle on the other end. the idea is that you exercise your muscles by stretching the spring from its natural length, which is 37 cm. if a 160 newton force is required to keep the spring stretched to a length of 47 cm, how much work is required to stretch it from 56 cm to 69 cm?

Clara is shopping in a grocery store with her friend. each has their own shopping cart in which they want to place their items. the shopping carts are identical. clara and her friend add the same type and number of items to each of their carts. in the baking aisle, however, clara adds 20 pounds of sugar to her own cart, and her friend adds only 10 pounds of sugar to her own cart. which of the following statements best explains what clara must do to accelerate at the same rate as her friend? a. she must add more sugar to her cart. b. she must apply more force to move her cart. c. she must add 20 pounds of salt instead of 20 pounds of sugar to her cart. d. she must apply less force to move her cart.