Nope. Instant acceleration and deccelerations occur, and then the time tends
to zero and the forces tends to infinite. It's called percussion in physics.
Classic example are the snooker balls. Also hitting a golf ball. No time
between the club hits the ball and it goes flying.
By definition the percussion is a sharp impact, where time is zero and force
infinite.

"hoarse with no name" escribió en el mensaje
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With all vehicle crashes it is worth remembering that deceleration is
equivalent to acceleration and that it takes an infinite amount of force
to accelerate instantly. This means we never accelerate/decelerate
instantly. When a vehicle crashes the time necessary to decelerate is
bought, so to speak, through the deformation of the structure. When an
unhelmeted body is thrown from the cycle and the head meets the ground
time for deceleration is bought the same way, through deformation of the
structure. I also believe that some of the velocity is redirected, often
perpendicular to the pavement. This is why the advantage goes to the
helmeted rider whose head decelerates by compressing the cushioning in
the helmet.