The car started at speed of 16 m/s with a time of 3 seconds.

i'm just gonna leave this comment here, so i can get a challange done-

explanation:

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

a skateboard rolling across the street - apex

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.