Rahman drops two stones P and Q each of mass 1 kg and 2 kg simultaneously from the top of a tower of height 20 m. Both start from rest and fall freely downwards. Find the time taken by the stone P to reach the ground. Does the stone Q reach the ground at the same time? Find the velocity of the stone Q with which it hits the ground. (Take g = 10 m/s2)
Answers
Answer:The friction experienced by a falling body is not only in amount, related to/properly sized, the coefficient of friction due to air or any medium it falls through, but also the size, shape of the body, and the surface area exposed to the air. As an example you can compare a small dense metal ball to a feather in your mind, the last thing just talked about/said being much larger in size but very light in mass which will take (in a big/important way) longer time to fall and hit the ground through air, compared to the small metal ball. Newton's famous equation on the force of gravitation which is F = G-M-m/d^2, and his second law of movement (F = ma) we can easily show that the rate of fall or increasing speed due to gravity is independent of the importance of the falling mass. The value of g is related to mass of the earth or any other (sun, moon, star, etc.) such as another planet, or the moon, or even a star.
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