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A long belt is moving horizontally with a speed of 5 km h^(-1). A child runs on this belt to and fro with a speed of 9 km//h (w.r.t. bett) between his father and mother located 50 m apart on the belt. For an observer on a stationalry plateform outsied, what is the (a) speed of the chils runningin the derection of motion of the belt, (b) speed of thechaild runing opposite to thedirection of the belt, and (c ) time taken by the child in cases (a) and (b) ? Which of theanswers change, if motionis viewed by one of the parents ?gt |
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Answer» Solution :Let US consider, left to right be the positive direction of x-axis. Here, `v_(B) = +5 km//h, v_(c) = –9 km//h` SPEED of child with respect to STATIONARY observer `V = v_(C) + v_(B) = –9 + 5 = –4 km//h` Here, negative SIGN shows that the child will appear to run in a direction opposite to the direction of motion of the belt. |
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