The box leaves position x=0 with speed v0. the box is slowed by a constant frictional force until it comes to rest at position x=x1. find ff, the magnitude of the average frictional force that acts on the box. (since you don't know the coefficient of friction, don't include it in your answer.)

Explanation:

Given that

At X=0 V=Vo

At X=X1  V=0

As we know that friction force is always try to oppose the motion of an object. It means that it provide acceleration in the negative direction.

We know that

So the friction force on the box

Ff= m x a

Where m is the mass of the box.

c

explanation:

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000