Question

Assertion :In high jump, it hurts less when an athlete lands on a heap of sand. Reason: Because of greater distance and hence greater time over which the motion of an athlete is stopped, the athlete experiences less force when lands on the heap of sand.

• 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 correct but Reason is incorrect
• D. Assertion is incorrect and Reason is correct

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Rate of change of momentum $\alpha$ applied force

$\left(\frac{△P}{△T}\alpha F\right)$

So when pumped to heap of sands $\frac{△P}{△T}$ (rate of change of momentum) is less because heap goes downward with body and increases time intervals, due to which less force is exerted on body.

And greater time over which motion of athlete is stopped experience less force on heap sand and due to greater distance less force is experienced.

So, both assertion and reason are correct and reason is correct explanation of assertion.