Question

33.
A steel ball of mass 509 is thrown vertically
downward with a velocity of 15m/s from a height
of 20m. It buries itself in the sandy ground to a
depth of 20cm. The magnitude of average force
exerted on the ball by the sand is nearly (g-10m/
$)
1) 78.1N
2) 78.6N
3) 77.6N
4) 8.3N​

Answer 1

Explanation:

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