work, force, energy, power, and kinematics

Physics
Tutor: None Selected Time limit: 1 Day

A 50 kg teenager just got his license and is driving his brand new Escalade (mass 1100 kg) at 30 m/s. As he is texting and driving, he crashes into a stopped minivan, which has a mass of 980 kg. Since he is not wearing a seatbelt, he flies out of the window after the crash. If the Escalade and Minivan move together with a speed of 13 m/s after the perfectly elastic crash, with what velocity is the teenage (former) driver now flying through the air?

May 26th, 2015

hello there welcome to study pool!

the energy  has before crash

1/2*m*v^2

=1/2*(1100+50)*30^2

=517500 j

total energy is constant

so 

517500=1/2*(980+1100)*13^2+1/2*50*v^2

165980=50/2*v^2

v=116 m/s


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May 26th, 2015

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May 26th, 2015
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