1 vật chịu tác dung của 1 lực 800N chuyển động được quãng đường S = 4m . Biết phương của lực hợp với phương chuyển dời 1 góc 60 độ. Tính : a) công của lực đã thực hiện được b) công suất của lực thực hiện trong thời gian 1,5s c) công suất tức thời ở thời điểm 1,5s biết ban đầu vật đứng yên. Em cần gấp

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