Physics Help?

Can someone please help me with the following questions?

1. A tugboat pulls a ship with a constant net horizontal force of 4.95 × 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 3.21 km ? Answer in units of J.

2a. A 77.3 kg base runner begins his slide into second base while moving at a speed of 4.6 m/s. The coefficient of friction between his
clothes and Earth is 0.68. He slides so that his speed is zero just as he reaches the base. The acceleration of gravity is 9.81 m/s 2. How much mechanical energy is lost due to friction acting on the runner? Answer in units of J.

2b. A 77.3 kg base runner begins his slide into
second base while moving at a speed of 4.6
m/s. The coefficient of friction between his
clothes and Earth is 0.68. He slides so that
his speed is zero just as he reaches the base.
The acceleration of gravity is 9.81 m/s
2. How much mechanical energy is lost due
to friction acting on the runner?
Answer in units of J.