Bai 26: 1 Chiec xe co khoi luong m= 100 kg dang chay voi van toc 30,6 km/h thi ham phanh.Biet luc ham phanh la 250 N.Tinh quang duong ham phanh den luc dung
Bai 27: Vat khoi luong 20 kg chuyen dong nhanh dan deu tu trang thai nghi, sau 10s di duoc quang duong 125 m.Hoi do lon hop luc tac dung len vat la bao nhieu?
