A force pushed me and Sam back and it knocked the wind out of us.

A force pushed me and Sam back and it knocked the wind out of us. What kind of force is the force on the student by the backpack?A gravitational force.A nuclear force.An electromagnetic force.三个选项 选哪个? 英文物理题（牛二律）An 92 N box of oranges is being pushed across a horizontal floor.As it moves,it is slowing at a constant rate of 0.80 m/s each second.The push force has a horizontal component of 40 N and a vertical component of 45 N dow They pushed with all their___,but the car did't move even a stone's throw A.strength B.force c.powerD.right 机械能量怎么求?我在国外上学,what is the total mechanical energy when a shopping trolley is pushed 10m with a force of 50N?Frictional force of 7.8N act on the shopping trolley. how can you force me to ask a question? 帮忙分析下句子结构 还有 意思.But in my inimitable leave -it- on-the-field style that has won and lost me many abarrie,I declined ,pushed for a win,and ended up losing an absolute heartbreaker. pushed 英语翻译把这篇文章翻译一下General Operating Principle of Hydraulic BuffersReferring to Fig.3,under the influence of an external force the piston rod (or plunger) (1) is pushed into the cylinder (2) in which there isa Newtonian,incompress Time and again pushed me into the Pinch:An act in which a force has compressed an area together. why you must force me when 和 if的区别It is said that me taxi drivers have metal wires stuck into the passager seats. and _______ a butten is pushed, the seat will give you an electric shock.China's laws do not seem to be the main problem, according to an officer. Th 解词： force a contract Force-A-Nature friction is a force that always acts an opposition movementopposition movement又是什么? stupidity is an elemental force for which no earthquake is a match May the force be with me 翻译