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Write the equation for momentum, first using symbols for the variables, then using words for the variables.

What are similarities and differences of reflection, refraction, diffraction and absorption?

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?