A student standing on a stationary skateboard tosses a textbook with a mass of mb = 1.8 kg to a friend standing in front of him. The student and the skateboard have a combined mass of mc = 113 kg and the book leaves his hand at a velocity of vb = 4.36 m/s at an angle of 34° with respect to the horizontal. Randomized Variablesmb = 1.8 kg mc = 113 kg vb = 4.36 m/s θ = 34° Calculate the magnitude of the velocity of the student, vs, in meters per second.  What is the magnitude of the momentum, pe, which was transferred from the skateboard to the the Earth during the time the book is being thrown (in kilogram meters per second)?

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.