The triangular wall of "Maringa Park" painted in brown color with an instruction "SMOKING IS PROHIBITED HERE". The sides of the wall are 5 m, 6 m, and 7 m respectively. What is the area of the wall
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" The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. ... Velocity is a physical vector quantity; both magnitude and direction are needed to define it. "
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