Answers by visitors named: Kaka Hanifah

W=F×scos# =ma×s cos# =0.5kg×9.8×2×cos30° =9.8×0.5 =9.8×1/2 =9.8/2 =4.9J

Question no 4. 20 ×300=6000 21×300=6300 Basically,21×3=63.The two zeros in which we omitted earlier will now be added to give you 6300.I hope you understand me better.Thanks for paying attention