a particle P is projected downwards with velocity 6ms-1. Calculate time taken for P to reach a speed of 18ms-1.
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In botany, a stoma, also called a stomate is a pore, found in the epidermis of leaves, stems, and other organs, that controls the rate of gas exchange. The pore is bordered by a pair of specialized parenchyma cells known as guard cells that are responsible for regulating the size of the stomatal opening
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