Question

23. A student uses a compressed spring of force constant 22 N/m to shoot a 7.5 x 10 power of -3 kg eraser across a desk. The magnitude of the force of friction on the eraser is
4.2 x 10 power of -2 N. How far along the horizontal desk will the eraser slide if the spring is initially compressed 3.5 cm? Use the law of conservation of energy.

Answer 1

the hint is given to you.. use the law of conservation of energy!!!...

initially the total energy is pure potential.. after release.. the total energy is pure kinectic... if there was no friction the eraser would keep on moving.. but since there is friction.. there is some deceleration.. now use 1d kinematics to find the distance