A problem in the text shows a 1700kg car hitting a wall
and crushing the front of the car. The car is moving at
49 km/hour constant velocity just before the impact. After
the impact a camera frame shows that the car has moved
or crushed about 2/9 of 2 meters in 5 x 10^-3 seconds, but
is not fully crushed yet. There are more frames showing the
rest of the crush until the car stops. Here's my question:
Original velocity before contact with the wall is ..
49 km/hour, or 49 x 10^3 / 3.6 x 10^3 = 13.6 meters/sec
the velocity I calculate in that first frame is ..
(2/9 x 2 meters) / (5 x 10^3) sec = .089 x 10^3 meters/sec
OR !!!!!!!! 89 METERS/ SECOND !!!!!!!!!! Well ???
This makes no sense to me, but D = R x T , and that's given in the text ???