Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement. Put another way, speed is a scalar value, while velocity is a vector.
The coefficient of restitution is a measure of the interaction of the ball with the material of the ground. Since the ground is too solid to move (usually), or give way, the energy of the ball-ground system must be conserved in the main. Some of the energy is released as sound waves but the rest is given to, or reflected back to the ball and it follows the path of reflection. When the ball is dropped vertically it returns along the same path. So the force is actually the potential energy created by dropping converted to kinetic energy on collision with the ground. This is the origin of the force making it bounce.
They use classification to keep track of all living things. This is how they record information on all living species.
The energy to be dissipated is proportional to 1/2 m v^2 ie proportional to v^2 for the same car
<span>In turn F * d = work done. </span>
<span>F is constant ( same brakes) </span>
<span>so d is proportional to v^2 </span>
<span>if v is multiplied by 3 then d is multiplied by 3^2 = 9 </span>
<span>distance = 180m</span>