H.W: A ball thrown up from a rooftop of height 40m lands on ground in 4s. (a)what is its maximum height above the ground? (b)what is its velocity 15m below the rooftop? Ans. (a)44.7m (b) v =-19.65 ! H.W: An object is thrown horizontally at 20m/s from a cliff top 45m above sea level. Find (a)the time to land; (bthe angle at which it hits the water; (c)the speed at which it hits the water. Ans. (a)3.03s (b)o = -54.73 (c)35.79m/s

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ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter2: Motion In One Dimension
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H.W: A ball thrown up from a rooftop of height 40m lands on ground in 4s.
(a)what is its maximum height above the ground? (b)what is its velocity 15m
below the rooftop?
Ans. (a)44.7m (b) v = -19.65 !
H.W: An object is thrown horizontally at 20m/s from a cliff top 45m above
sea level. Find (a)the time to land; (b)the angle at which it hits the water;
(c)the speed at which it hits the water.
Ans. (a)3.03s (b)0 = -54.73 (e)35.79m/s
II
Transcribed Image Text:H.W: A ball thrown up from a rooftop of height 40m lands on ground in 4s. (a)what is its maximum height above the ground? (b)what is its velocity 15m below the rooftop? Ans. (a)44.7m (b) v = -19.65 ! H.W: An object is thrown horizontally at 20m/s from a cliff top 45m above sea level. Find (a)the time to land; (b)the angle at which it hits the water; (c)the speed at which it hits the water. Ans. (a)3.03s (b)0 = -54.73 (e)35.79m/s II
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