"A stone of mass 20 g is projected from a rubber catapult of length 0.1 m and area of cross section 10$-$6 m2 stretched by an amount 0.04 m. The velocity of the projected stone is ______________ m/s.(Young's modulus of rubber = 0.5 $\times$ 109 N/m2)"

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"By energy conservation

${1 \over 2}.{{YA} \over L}.{x^2} = {1 \over 2}m{v^2}$

$${{0.5 \times {{10}^9} \times {{10}^{ - 6}} \times {{(0.04)}^2}} \over {0.1}} = {{20} \over {1000}}{v^2}$$

$\therefore$ ${v^2} = 400$

$v = 20$ m/s"

A stone of mass 20 g is projected from a rubber catapult of length 0.1 m and area of cross section 10^$-$6 m² stretched by an amount 0.04 m. The velocity of the projected stone is ______________ m/s.

(Young's modulus of rubber = 0.5 $\times$ 10⁹ N/m²)

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A stone of mass 20 g is projected from a rubber catapult of length 0.1 m and area of cross section 10$-$6 m2 stretched by an amount 0.04 m. The velocity of the projected stone is ______________ m/s.(Young's modulus of rubber = 0.5 $\times$ 109 N/m2)

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A stone of mass 20 g is projected from a rubber catapult of length 0.1 m and area of cross section 10^$-$6 m² stretched by an amount 0.04 m. The velocity of the projected stone is ______________ m/s.

(Young's modulus of rubber = 0.5 $\times$ 10⁹ N/m²)