A dise of mass 10 g is kept floating horizontally by throwing 10 marbles per secound against it from below . If mass of each marble is 5 g Calculate the velocity with which marbles are striking the disc . Assume that marbles strike the disc . Normally and rebound downwards with the same speed.

Explanation

To solve the problem, we need to find the velocity with which the marbles are striking the disc in order to keep it floating. Let's break down the solution step by step.

### Step 1: Understand the Forces Acting on the Disc
The disc has a mass of 10 g, which is equivalent to \(10 \times 10^{-3}\) kg. The weight of the disc (force due to gravity) can be calculated using the formula:
\[ F_g = mg \]
where \(m\) is the mass of the disc and \(g\) is the acceleration due to gravity (approximately \(9.8 \, \text{m/s}^2\)).
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