Adancer starts 3 meters from the curtain then moves 8 meters from the curtain in 15 seconds. what was his velocity?

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -

wavelegth as in spectrum red oygbiv