Homework 7 Microsoft Edge entProblemiD-811778148 offset-next Home Work Problem 6
ID: 1779446 • Letter: H
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Homework 7 Microsoft Edge entProblemiD-811778148 offset-next Home Work Problem 6.54 Resourtes previous 14 of 13 | Problem 6.54 Part A Aprojectile is fired at an upward angle of 35 0 from the top of a 195 m diff with a speed of 155 What will be its speed when it strikes the ground below? (Use conservation of energy and neglect air resistance) m/s Express your answer to three significant figures and include the appropriate units. an Value Units xt dy Submit My Answers Give Up O Type here to searchExplanation / Answer
total mechanical energy at the top of cliff E1 = m*g*h + (1/2)*m*v1^2
total mechanical before striking ground E2 = (1/2)*m*v2^2
from conservation of energy
totla mechanical energy is constant at all points
E2 = E1
(1/2)*m*v2^2 = m*g*h + (1/2)*m*v1^2
v2 = sqrt(v1^2 + 2*g*h)
v2 =sqrt(155^2 + (2*9.8*195))
v2 = 166.87 m/s <<<<<<<<<------------ANSWER
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