The 5-kg block is falling downward

The 5-kg block is falling downward at v1 2 m/s when it is 8 m from the sandy surface, Determine the average impulsive force acting on the block by the sand if the motion of the block is stopped in 0.9 s once the block strikes the sand. Neglect the distance the block dents into the sand and assume the block does not rebound. Neglect the weight of the block during the impact with the sand.
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