A 2.8 kg box is sliding along a frictionless horizontal surface with a speed of 1.8 m/s when it encounters a spring. (a)

[answerhappygod]

A 2.8 kg box is sliding along a frictionlesshorizontal surface with a speed of 1.8 m/s when itencounters a spring.
(a)
Determine the force constant (in N/m) of the spring, if the boxcompresses the spring 5.4 cm before coming torest.
N/m
(b)
Determine the initial speed (in m/s) the box would need in orderto compress the spring by 1.3 cm.
m/s