1. An impulse is a force acting over some amount of time to cause a change in momentum. On the other hand, work is a acting over some amount of to cause a change in .

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2 . how much is the spring compressed x from its natural length?