Question B only Preview File Edit View Go Tools Window Help ·T) 8 :) 50961L- Sun

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Question B only

Preview File Edit View Go Tools Window Help ·T) 8 :) 50961L- Sun Mar 25 7:03 PM C E @ /D PortalGuard Single Sign-C X'(-) Dashboard x Files xy Ph 105.Test1-03-20-17-G/XYe You Are In A Train That is x17 C | file://users/jessicagonzalez/Downloads/Ph105-Test1-03-20-17-GCC%20(1).pdf Problem 1 A) You are in a train that is going 45 mph North. You get up and walk in the opposite direction of the train's motion with a speed of 5 mph. How fast, and in what direction, are you going relative to the ground? B) Take it as a fact that everything stationary on the train is moving with the train with the same horizontal velocity. You sit down and you start throwing a ball up in the air. (i) You throw the ball with an initial velocity of 1 m/s upward, relative to yourself. When will it land back in you hand (your hand does not move after releasing the ball)? (ii) During the time that the ball is in the air, how far does it move horizontally relative to the ground outside? (ii) Explain why this scenario can serve as an example of projective motion. 25

Explanation / Answer

part A :

here Vtg = 45 mph ; Vpt = 5 mph

for a person outside the train,

two speeds are opposite to each other

so relative Speed Vpg = Vpt - Vtg

Vpg = 5 - 45 =- 40 mph

and is a driection opposite to train moiton . i.e south

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B:

i)

total time of flight T = ta + td

each ta = td = u/g

so

T = 1/9.81 + 1/9.81

T = 0.203 secs

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ii) Horizontal Distance R = Vx t

R = 1 * 0.203 = 0.203 m

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iii) since the path followed is a parabolic path this serves as projectle motion

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