JEE Main 2022 · 29 Jul · Shift 1 · Physics Q33 · Dronacharya Exams

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PhysicsSingle correct+4 / -1Question 33 of 90

If $t=\sqrt x+4$ , then $\left(\dfrac{dx}{dt}\right)_{t=4}$ is :

A

4

B

zero

C

8

D

16

Answer and worked solution

Official answer: B

Invert. $x=(t-4)^2$ , so $\frac{dx}{dt}=2(t-4)=0$ at $t=4$ .

(B)

Topics:Motion in a straight line

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