Select all of the following statements that are true (assumi

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Select all of the following statements that are true (assuming Newtonian mechanics).E.g.,enter BCD.)
A) The work required to lift a mass one meter does not depend on the speed at which it is raised.
B) An object's kinetic energy can change without any net work being done on it.
C) The acceleration of an object is the same in all inertial reference frames.
D) The power required to lift a mass depends on the speed at which the mass is raised.
E) A simple machine cannot reduce the work required to do a task
F) The work done by a constant force acting on an object is equal to the magnitude of the force times the distance the object moves.

ACDE
再问： An object of mass m = 3.00 kg is travelling on a horizontal surface. The coefficient of kinetic friction between the object and the surface is µk = 0.290. The object has speed v = 1.22 m/s when it reaches x = 0 and encounters a spring. The object compresses the spring a distance d/2, stops instantaneously, and then travels back to x = 0 where it stops completely. 真心求教啊
再答： ABF ½mv²=mgμd d=v²/2gμ=0.2619m Espring=½mv²-mgμd/2=6.049 J Espring=½k(d/2)² k=8Espring/d²=705.51 N/m

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