Question

Assume g = 10 m/s2 A 4.0-kg block is released from rest at point A. The track is frictionless except for the rough portion between points B and C. The block travels down the track, hits a spring of force constant 2000 N/m, and compresses the spring 0.20 m from its equilibrium position before coming to rest momentarily. What is the work done by the gravitational force as the block moves from A to B? (A) 3.00 m M Select one: O A. 40 ) B. - 40 ) C. Zero D. - 120)

Answer 1

mass of block m = 4 kg g = lo mis h=3m height h by the gravitational force Work done as the block moves from A to B . wa-mgh : = - 4xlox3 w =-120/5