How far away is a train if you see the steam from it’s nozzle 5sec before you hear it’s sound(take the speed of sound is 331m/s)

so the train is 1655m away

Explanation:

speed of sound=331m/s

time taken=5s

distance=?

as we know that

speed=distance/time

here we have to find the distance

speed×time=distance

distance=331m/s×5s

distance=1655m

Option A

The force of kinetic friction is smaller than that of static friction, but Fg remains the same

Explanation:

Since coefficient of static friction is greater than the coeffiecient of kinetic friction, the box accelerates down the board. This is attributed to the fact that frictional force on the sliding box is less than frictional force for the box at rest. Therefore, there’s non-zero net force on the box as it slides downwards. Conclusively, option A is correct as the force of kinetic friction is smaller than that of static friction, but the component of force of gravity, Fg remains constant