Knowledge is power ,
sharing knowledge is powerful
جسم كتلته 500 جم يسقط من ارتفاع 4.9 متر عن سطح الارض فتكون كمية
حركته لحظة وصوله للارض مساوية ................ كجم م / ث
ا- 2.45
ب- 4.9
ج- 2450
د- 4900
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