A 34.9kg child starting from rest slides down a water slidewith a vertical heigh

Question

A 34.9kg child starting from rest slides down a water slidewith a vertical height of 19.0 m. a) What is the child's speed halfway down the slide'sverticaldistance________m/s b)What is the child's speed three-quarters of the waydown_______m/s A man pushes a lawn mower on a level lawn with a force of214N. If 25% of this force is directed downward , and 57 W ofpower is espende in pushing the mower 5.5 m , how much time isspent in pushing the mower this distance__________s A 34.9kg child starting from rest slides down a water slidewith a vertical height of 19.0 m. a) What is the child's speed halfway down the slide'sverticaldistance________m/s b)What is the child's speed three-quarters of the waydown_______m/s A man pushes a lawn mower on a level lawn with a force of214N. If 25% of this force is directed downward , and 57 W ofpower is espende in pushing the mower 5.5 m , how much time isspent in pushing the mower this distance__________s

Explanation / Answer

a) we know that            v = 2 g h'                = 2 * g (h /2)                = gh                = 9.8 * 19                = 13.64 m/s b)            v = 2 g h'                = 2 * g (3h /4)                = 3gh / 2                = 3* 9.8 * 19 /2                = 16.71 m/s c) t = W / P = F . S / P = 0.25 *214 * 5.5 / 57 = 5.162 s

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