Amarshmallow gun uses a spring to launch marshmallows. the spring has a spring constant of 200 n/m. the marshmallow has a mass of 0.05 kg and when the marshmallow gun is fired straight up into the air, the marshmallow reaches a maximum height of 18 meters. what is the mechanical energy in the system?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

I’ve been stuck on this for a while

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.