bai 22: 1 vat co khoi luong 2,0 kg chuyen dong thang nhanh deu voi trang thai nghi.Vat di duoc 80 cm trong 0,5 s.Gia toc cua vat va hop luc tac dung vao no co do lon la bao nhieu?
Bai 23: 1 luc khong doi tac dung vao 1 vat co khoi luong 5 kg lam van toc cua no tang dan tu 2,0 m/s den 8,0 m/s trong 3,0 s.Luc tac dung vao vat bang bao nhieu?
