# Volkswagen collides with large truck: Magnitude, direction, velocity, kinetic energy

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A 1000-kg Volkswagen with speed 30m/sec collides head-on with a large truck of mass 10,000kg and speed 25m/sec. As a result of the collision, the two vehicles lock together.

a. Find the magnitude and the direction of the velocity of the vehicles right after the collision.

b. Compute the total Kinetic energies before and after the collision.

c. Is the collision elastic or inelastic?

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Solution:

a) Assume that Volkswagen with mass M1=1000kg is moving at V1=30m/s from left to right and a large truck with mass M2=10,000kg is moving at V2=25m/s from right to left. Assume that the velocity of the vehicles right after the collision is V. Then we can set up the following ...

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- BSc , Wuhan Univ. China
- MA, Shandong Univ.

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- "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
- "excellent work"
- "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
- "Thank you"
- "Thank you very much for your valuable time and assistance!"

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