Answer: 7.1714m/s
Explanation:
Work is the change in mechanical energy. The initial energy is 0 (no kinetic energy as the canoe is at rest & no potential energy assuming h=0). This means the final mechanical energy (Final kinetic + final potential) is 1800J. Again, assuming h=0 the final potential is 0J. So, the final kinetic energy = 1800J. KE = (0.5)(mass)(velocity^2). 1800 = (0.5)(70)(Vf^2). Solving for V, the canoes final velocity is about 7.1714m/s.
