i need help with physics problems!!!?

[dukeballer32]

i have no clue how to do these problems. if you can tell me how to do them too that would be great.

A tugboat pulls a ship with a constant net
horizontal force of 4.19 × 103 N and causes
the ship to move through a harbor.
How much work does the tugboat do on the
ship if each moves a distance of 3.20 km ?
Answer in units of J.

A horizontal force of 149 N is used to push a
43.0 kg packing crate a distance of 6.00 m on
a rough horizontal surface.
The acceleration of gravity is 9.81 m/s2 .
If the crate moves with constant velocity,
calculate
a) the work done by the force.
Answer in units of J.
b) the coefficient of kinetic friction.

A student weighing 623 N climbs at constant
speed to the top of an 14 m vertical rope in
16 s. What is the average power expended by the
student to overcome gravity?
Answer in units of W.

A 1.78×103 kg car accelerates uniformly from
rest to 14.1 m/s in 2.25 s.
a) What is the work done on the car in this
time interval?
Answer in units of J.
What is the power delivered by the engine
in this time interval?
Answer in units of W.