Two buses leave a bus station and travel in opposite directions from that same starting point. if the speed of one is twice the speed of the other and they are 240 km apart at the end of one hour, what is the speed of each bus?

80 km/h

Explanation:

Let's take the origin at the bus station, x = 0.

We choose the direction of the first bus as the positive direction, so that its position at time t is

where v is the speed of the bus.

The second bus travels in the opposite direction at twice the speed, 2v, so its position at time t is

After 1 hour,

t = 1 h

The two buses are 240 km far apart, so

And substituting the expressions for x1 and x2, we find

Substituting t = 1, we find v:

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

f=ma newton's second law 7x8=56n