Please asap 1. A student throws a set of keys vertically upward to his fraternitybrother, who is in a window 4.20 m above. The brother'soutstretched hand catches the keys 1.30 s later. (Take upward asthe positive direction. Indicate the direction with the sign of youranswer.)(a) With what initial velocity were the keys thrown?(b) What was the velocity of the keys just before they were caught?2. A tennis player tosses a tennis ball straight up and then catches itafter 1.99 s at the same height as the point of release.magnitude= 9.8m/s^2 direction= downwardvelocity when it reaches maximum height= 0m/s direction= themagnitude zero(c) Find the initial velocity of the ball.(d) Find the maximum height it reaches.3. Traumatic brain injury such as concussion results when the headundergoes a very large acceleration. Generally, an acceleration lessthan 800 m/s² lasting for any length of time will not cause injury,whereas an acceleration greater than 1,000 m/s² lasting for at least 1ms will cause injury. Suppose a small child rolls off a bed that is 0.60m above the floor. If the floor is hardwood, the child's head isbrought to rest in approximately 2.1 mm. If the floor is carpeted, thisstopping distance is increased to about 1.1 cm. Calculate themagnitude and duration of the deceleration in both cases, todetermine the risk of injury. Assume the child remains horizontalduring the fall to the floor. Note that a more complicated fall couldresult in a head velocity greater or less than the speed you calculate.hardwood floor magnitudehardwood floor durationcarpeted floor magnitudecarpeted floor duration

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Description: Please asap 1. A student throws a set of keys vertically upward to his fraternitybrother, who is in a window 4.20 m above. The brother'soutstretched hand catches the keys 1.30 s later. (Take upward asthe positive direction. Indicate the direction wit

GivenHeight Time initial velocity u = ?final velocity v = ?gravitational acceleration

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1. A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.20 m above. The brother's outstretched hand catches the keys 1.30 s later. (Take upward as the positive direction. Indicate the direction with the sign of your answer.) (a) With what initial velocity were the keys thrown? (b) What was the velocity of the keys just before they were caught?

1. A student throws a set of keys vertically upward to his fraternity brother, who is in a window 4.20 m above. The brother's outstretched hand catches the keys 1.30 s later. (Take upward as the positive direction. Indicate the direction with the sign of your answer.) (a) With what initial velocity were the keys thrown? (b) What was the velocity of the keys just before they were caught?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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