A boxcar of mass 200 tons at rest becomes uncoupled on a 2.5F $\degree$ grade.If the track is considered to be frictionless,what speed does the boxcar have after 10 seconds?
A)0.37 m/s
B)0.59 m/s
C)1.3 m/s
D)4.3 m/s

Question

Quizplus · Accepted Answer

The correct answer is D.The boxcar has an acceleration of 2.5 m/s^2 down the grade. After 10 seconds, its speed will be:v = u + at = 0 + 2.5 * 10 = 25 m/sConverting to km/h:v = 25 * 3.6 = 90 km/hConverting to m/s:v = 90 * 1000 / 3600 = 25 m/s

A Boxcar of Mass 200 Tons at Rest Becomes Uncoupled °\degree°

A Boxcar of Mass 200 Tons at Rest Becomes Uncoupled $\degree$