0.00032cm*4.02=1.2864 × 10^-3 in scientific notation.
Op here is another problem exactly like that. Just plug in your variables instead. And remember, time is never negative.
Answer:
A) Energy is dissipated into heat and sound energy due to Friction
B) The energy goes into heat and sound energy due to friction again, otherwise the cart would accelerate due to an unbalanced force. Therefore, we know there's friction, and the friction causes energy loss.