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Weight and Acceleration

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1. A ball is dropped from a tree. How many feet does the ball drop in 0.43 seconds?

2. The gasoline consumption of a small car is 27 kilometers per liter. How many miles per gallon is this?

3. If a car is moving at 19 meters per second, how many miles has it gone in 2 hours?

4. On Mars, the acceleration due to gravity is g = 3.7 meters per second squared. A watermelon weighs 4 kilograms on earth. What would it weigh on Mars?

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The solution discusses questions regarding weight and acceleration.

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Answer 1: 2.972 feet
Calculations: s=4.9t^2=4.9*0.43^2=0.90601 meters = 0.90610*3.28 feet= 2.972 feet

Answer 2: ...

Solution provided by:
Changping Wang, MA
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "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!"
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