Ablock slides down a plane inclinded at an angle of 37° to the vertical with an acceleration of 6m/s each second. what is the coefficient of friction between the block and the plane?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?