The magnitude of the net force exerted in the x direction on a 4.00-kg particle varies in time as shown in the figure below. F (N) 3 2 1 t (s) 4 5 1 2 3 (a) Find the impulse of the force over the 5.00-s time interval. ỉ = 12.0 N.s (b) Find the final velocity the particle attains if it is originally at rest. 3.00 m/s (c) Find its final velocity if its original velocity is -3.50 î m/s. v, = -0.50 m/s

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.