Car A experienced a greater impulse, because it stopped in a shorter amount of time.
Impulse is defined as the change in force over time. Since both cars have the same mass, as well as the same initial and final velocities, the only factor that makes a difference is the time taken to achieve the stop.
100 J of kinetic energy but no gravitational potential energy if GPE of the ground is assumed to be zero.
<h3>Explanation</h3>
Kinetic Energy
The ball carries kinetic energy for being in motion. The size of that energy is given as:
where
- is the mass of the object, and
- is its speed.
SI units:
- : joules.
- : kilograms.
- : meters per second.
For this ball:
.
Gravitational Potential Energy
Whether the ball carries gravitational potential energy depends on the point of zero potential energy. The ball would carry GPE if the point of zero potential energy is chosen underground. However, the question emphasizes that the ball is "on the ground," which <em>implies</em> that the ground is the reference with a GPE of zero.
The gravitational field near the Earth's surface is constant. As a result, GPE is proportional to height relative to the ground (or the point of zero GPE). The ball is on the ground. Its height is zero. As a result, its GPE is also zero.
Um what? are their any choices? wait this isnt science is it> 0.0
<h2>About 1 trillion billion stars (21 0's)</h2><h2 />
There is an average of 100 billion stars per galaxy. But you are looking for a universe, which is bigger than a galaxy.
According to UCSB Science Line, there are about 1 trillion billion stars in the observable universe. That's one 1 and twenty-one 0's.