Theresa Lopez Mendiola's picture

Please pahelp po :)
A mass of 20kg is projected up an inclined of 26 degrees with a velocity of 4 m/s. If the coefficient of friction is 0.2, find i) the maximum distance that the package will move along the plane. and ii) what will be the velocity of the package when it comes back to initial position.

Alexander's picture

Energy equation for going upward
E1 - Elost = E2
1/2 mv12 - Friction x s = mgh
1/2 (20)(42) - 0.2(20 cos 26deg)(9.81) s = 20(9.81)(s sin 26deg)
s = 1.32 m

For going downward, v1 = 4 m/sec

Theresa Lopez Mendiola's picture

Thank you po.