A cart rolls down an inclined track and collides with a wood block at the end of the track. The wood block is padded with another block made of metal, wood, or foam, for four different experimental runs. Since the car is released from rest at the same position on the track every time, its speed when it makes contact with the block is approximately the same every time. An acceleration sensor measures the acceleration as a function of time during the collision and a computer displays the output of the acceleration sensor. The magnitude of the interaction force F is proportional to the acceleration, F = ma. The output of the acceleration sensor under different collision conditions is shown below. The cart collides with an aluminum block. The magnitude of the maximum measured acceleration is ~22 m/s2. The collision lasts for ~0.09 s