If a boat and its riders have a mass of 1200 kg and the boat drifts in at 1.8 m/s how much work does sam do to stop it?

M = 1200 kg, the mass of the boat and its occupants

v = 1.8 m/s, the speed of the boat

The KE (kinetic energy) of the boat is

KE = (1/2) * m*v²

= 0.5 * (1200 kg) * (1.8 m/s) ²

= 1944 J

To stop the boat, the work done should be equal to the KE of the boat.

Therefore the work done is 1944 J.

Answer: 1944 J