s: Ch 07 HW Part 1 ID-78596703 A Gid on a Tra A Girl on a Trampoline Part A A gi

Question

s: Ch 07 HW Part 1 ID-78596703 A Gid on a Tra A Girl on a Trampoline Part A A girl of inertia mi 60 kilograms springs from a trampoline with an initial upward velocity of vi8.0 meters per second At height h = 2.0 meters above the trampoline, the girl grabs a box of inertia n2 15 What is the speed Uhefore of the girl immediately before she grabs the box? Express your answer numerically in meters per second. Hints For this problem, use g = 9.8 m second for the magnitude of the acceleration due to gravity m/s Give Up Part B What is the speed Uafter of the girl immediately after she grabs the box? per second. Mi2 Hints Mm BubmitMy Answers Give Up Part C

Explanation / Answer

here,

m1 = 60 kg

m2 = 15 kg

vi = 8 m/s

h = 2 m

a)

the speed of girl before she grabs the box be v1

v1^2 - vi^2 = - 2 * g * h

v1^2 - 8^2 = - 2 * 9.81 * 2

v1 = 4.98 m/s

b)

let the speed after the girl grabs the boc be vf

using conservation of momentum

m1 * v1 = (m1 + m2) * vf

60 * 4.98 = ( 60 + 15) * vf

vf = 3.98 m/s

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