A uniform meter stick pivoted at its center has a 155-g mass suspended at the 18.5-cm position and a 25.0-g mass suspended at the 38.4-cm position. At what position should a 275-g mass be suspended
to put the system into equilibrium?

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

well clustered together.

points close on a scatter diagram

the speed of the cart after 3 seconds of low fan speed is ⇒ 54.0 cm/s.

the speed of the cart after 5 seconds of medium fan speed is ⇒ 120.0 cm/s.

the speed of the cart after 2 seconds of high fan speed is ⇒ 64.0 cm/s. 

just did the lab.