Question

Assertion :The equation of motion in straight line is given as $v^2$ - $u^2$=$as$.(symbols have their usual meaning) Reason: Equation given is, dimensionally correct

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is incorrect but Reason is correct
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is C Assertion is incorrect but Reason is correct

As we know equation of motion in a straight line can be written as

$v^2-u^2=2as$ where $v$ is final velocity $u$ is initial velocity and $a$ is acceleration.

As there is a missing of an integer $2$ in the above equation and rest of the things are same. And $2$ is dimensionless, so the equation is dimensionally correct.

Hence Assertion is incorrect and Reason is correct.