Posted by **Mary** on Monday, February 26, 2007 at 1:19am.

A power boat of mass 475 kg is cruising at a constant speed of 8.9 m/s. The propeller provides a drive force of 770 N. The driver of the boat shuts off the engine, and the boat coasts to a halt. Assume -- contrary to fact -- that the resistive force due to the water is constant, independent of the boat's speed.

(a) How far does the boat coast?

(b) How much time does it take for the boat to come to rest after the engine is turned off?

friction force is 770N.

KEinitial=frictionforce*distance

solve for distance.

The average speed is 8.9/2 m/s. You know the distance

time=distance/avgspeed.

## Answer This Question

## Related Questions

- physics - A power boat of mass 465 kg is cruising at a constant speed of 8.9 m/s...
- Physics - A power boat of mass 460 kg is cruising at a constant speed of 8.9 m/s...
- Physics - A power boat of mass 495 kg is cruising at a constant speed of 8.9 m/s...
- physics - A power boat of mass 460 kg is cruising at a constant speed of 8.9 m/s...
- Physics - A 1250 kg boat is traveling at 90 km/h when its engine is shut off. ...
- Physics - A 1250 kg boat is traveling at 90 km/h when its engine is shut off. ...
- Physics - A 1250 kg boat is traveling at 90 km/h when its engine is shut off. ...
- physics - A 1000 kg boat is traveling at 90 km/h when its engine is shut off. ...
- algebra - The power P needed to propel a boat is directly proportional to the ...
- math - A particular power boat travelling at V0 km/h when its power is turned ...

More Related Questions