Hey,
There's a question that I'm really struggling with it.
A rail wagon moving at a speed of 2.0m/s on a level track reached a steady incline which slowed it down to rest in 15.0s and caused it to reverse.
Calculate:
a) the distance it moved up the incline
b) its acceleration on the incline
c) its velocity and position on the incline after 20.0s
I got a & b and they both make perfect sense.
However, C's work solution doesn't make sense AT ALL.
a) S=15m
b) A= -0.13m/s/s
For c) the work solution is:
u=2m/s
a=-0.133m/s/s
t=20s
And therefore, V= -0.67m/s & S=13.4m
IT DOESN'T MAKE ANY LOGICAL SENSE to use U as 2? I mean how did you know?? I thought U is 0 because it stopped and then it will reverse down the slope, so U shall be 0 not 2m/s.
If anybody has any decent explanation, I'll be very thankful. Please. It's driving me crazy.