80. The radius vector of a material point moving in the


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Description 80. The radius vector of a material point moving in the
80. The radius vector of a material point moving in the gravitational field of the Earth, described by the equation r = υ0ti  gt2 / 2j, where υ0 = 76 m / s, g  acceleration of gravity; i, j  the unit vectors of the coordinate axes x and y. Determine the time t1, after starting, when the velocity vector υ point at an angle α = 35 ° to the horizontal. What is the velocity υ at this time?
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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)