Question

23. A student uses a compressed spring of force constant
22 N/m to shoot a 7.5  103-kg eraser across a desk.
The magnitude of the force of friction on the eraser is
4.2  102 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

It should be "A student uses a compressed spring of force constant
22 N/m to shoot a 7.5 X10 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. " and the rest of the question is same.