16. A 4.8-kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.50 m, a velocity of -0.80 m/s, and an acceleration of +8.3 m/s2. The force constant of the spring is closest to

Question

16.	A 4.8-kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface. At time t = 0 s, the block has a displacement of -0.50 m, a velocity of -0.80 m/s, and an acceleration of +8.3 m/s2. The force constant of the spring is closest to

A.	56 N/m
B.	62 N/m
C.	73 N/m
D.	80 N/m

17.	A 0.068 kg block on a horizontal frictionless surface is attached to a spring whose force constant is 390 N/m. The block is pulled from its equilibrium position at x = 0 m to a displacement x = + 0.080 m and is released from rest. The block then executes SHM along the x-axis. The maximum elastic potential energy of the system is closest to

A.	1.1 J
B.	1.2 J
C.	1.4 J
D.	1.5 J