Class Management I Help Homework 3 Begin Date: 1/22/2018 12:00:00 AM- Due Date:
ID: 1578971 • Letter: C
Question
Class Management I Help Homework 3 Begin Date: 1/22/2018 12:00:00 AM- Due Date: 2/12/2018 11:59:00 PM End Date: 2/12/2018 11:59:00 PM (896) Problem 5: A ball is thrown horizontally from the top of a 85 m building and lands 110 m from the base of the building Ignore air resistance, and use a coordinate system whose origin is at the top of the building, with positive y upwards and positive x in the direction of the throw. 2596 Part (a) How long is the ball in the air in seconds? Grade S Deductic Potential t- asin acos0 Submiss Amempta per atan acotan n1 coshO tanh0 cotanh0 detailed Degrees O Radians Submit Hints: 2 deduction per hint. Hints remaining Feedback:--deduction per feedback. - 25% Part (b) what must have been the initial horizontal component of the velocity, in meters per second? 2596 Part (c) What is the vertical component of the velocity just before the ball hits the ground, in meters per second? 25% Part (d) what is the magnitude of the velocity of the ball just before it hits the ground, in meters per second?Explanation / Answer
a) t = sqrt(2h/g) = sqrt(2*85/9.81) = 4.16 sec
b) vo = ?
Range R = Vo*t
110 = Vo*4.16
Vo = 110/4.16 = 26.45 m/s
c) Vy = g*t = 9.81*4.16 = 40.81 m/s
d) v = sqrt(Vx^2+vy^2) = sqrt(26.45^2+40.81^2) = 48.63 m/s