How long does it take a train accelerating from 25.4 m/s to 81.2 m/s to cover 2130 m? A. 40.0 s
B. 76.3 s
C. 20.0 s
D. 38.2 s​

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.

Which planets are visible without a telescope