A hailstone traveling with a velocity of 43 meters per second comes to a virtual stop at 0.28 seconds after hitting water. what is the magnitude of it acceleration in water

Magnitude of acceleration = (change in speed) / (time for the change)

Change in speed = (final speed) minus (initial speed)

= (zero) minus (43 m/s) = - 43 m/s.

Magnitude of acceleration = ( - 43 m/s) / (0.28 sec) = - 153.6 m/s²

(about - 15.7 G's)