Question

A boxcar of mass 200 tons at rest becomes uncoupled on a 2.5 degree grade. If the track is considered to be frictionless, what speed does the boxcar have after 10 seconds?

Answer 1

a=gsin(theta)
a=9.8 sin 25°
a= 0.43

Uf=Ui +at
Uf= 0 + a(10)
Uf=0 +4.3
Uf=4.3 m/s

Answer 2

frick