Question

Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 m long. The first moves past her in 1.75 s and the second in 1.17 s. Find the constant acceleration of the train.

I know how to find average acceleration (vcf- vxi/tf-ti)but don't understand how to find CONSTANT acceleration.

Answer 1

acceleration= deltav/time=(8.6/1.17 -8.6/1.75)/time

now time here is (1.75+1.17)/2
solve for acceleration.

Answer 2

1.66 m/s^2! Thanks