Ablock of mass m is pushed up against a spring, compressing it a distance x, and the block is then released. the spring projects the block along a frictionless horizontal surface, giving the block a speed v. the same spring projects a second block of mass 4m, giving it a speed of 5v. what distance was the spring compressed in the second case?

Explanation:

By energy conservation we know that spring energy is converted into kinetic energy of the block

so we will have

so we will have

now we will have same thing for another mass 4m which moves out with speed 5v

so we have

now from above two equations we have

so we have

true

explanation:

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)