A train takes 8 m to stop after 6 seconds. What was the train’s original speed?

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Which accurately compares concave and convex lenses?