Question

please let me know the answer​

Answer 1

$\large{\bold{\underline{\underline{Solution :-}}}}$

$\bold{\underline{To find}}$

Relative acceleration = ?

I.e. ${a_r = (to\: find)}$

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$\bold{\underline{\underline{Step - by - Step - Explanation}}}$

• The first ball is thrown upwards, as it moves against gravity the acceleration due to gravity (g) will be negative for it.

• The second ball is thrown downwards, as it moves with the gravity pull its acceleration due to gravity (g) is positive for it.

So, Now acceleration of 1st ball is ${a_1 = - g}$

and, acceleration of 2nd ball is ${a_2 = g}$

As they are moving in opposite direction the relative acceleration will get added up.

${a_r = a_1 + a_2}$

substituting the values.

${a_r = -g + g}$

both the "g" gets cancel

so, Now it comes as

${a_r = 0 m/s^2}$

$\huge{\boxed{\boxed{a_r = 0 m/s^2}}}$

So,the relative acceleration of the two ball is 0 m/s²(option-3).