Hard Physics Problems. Could anyone please help me?

[Theoden K]

1. A 1.80 kg block slides on a rough, horizontal surface. The block hits a spring with a speed of 2.20 m/s and compresses it a distance of 14.0 cm before coming to rest. If the coefficient of kinetic friction between the block and the surface is µk = 0.560, what is the force constant of the spring?
N/m

2. A 1.6 kg block slides down a frictionless ramp, as shown in Figure 8-28. The top of the ramp is 1.5 m above the ground; the bottom of the ramp is h = 0.20 m above the ground. The block leaves the ramp moving horizontally, and lands a horizontal distance d away. Find the distance d.
m
http://www.webassign.net/walker/08-25alt.gif

3. A 2.0 kg block slides with a speed of 1.1 m/s on a frictionless, horizontal surface until it encounters a spring.
What initial speed should the block have to compress the spring by 1.6 cm?
m/s

Thank you for any help.
4. A 1.8 kg block slides down a ramp with friction, as shown in Figure 8-28. The top of the ramp is 1.5 m above the ground; the bottom of the ramp is h = 0.19 m above the ground. The block leaves the ramp moving horizontally, and lands a horizontal distance d away. Find the distance d for the case in which friction on the ramp does -8.5 J of work on the block before it becomes airborne.
m
http://www.webassign.net/walker/08-25alt.gif