You use a hanging mass to pull sideways on a cart and you release it and let it

Question

You use a hanging mass to pull sideways on a cart and you release it and let it run to the end of the track until it hits the endstop. Logger Pro captures the acceleration data. Why can't you average the whole acceleration data set to get the value of the acceleration for your calculation of the cart mass? Multiple choice

a.The acceleration starts positive as the cart rolls and goes negative when the cart stops so the average is always zero.
b. The acceleration starts at zero, goes to a non-zero value, then drops to zero again and has a large spike when it hits the end. The average tries to smooth over this and gives a wrong answer

Explanation / Answer

because it's still falling, and it's not at a constant rate

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