Five persons A, B, C, D and E are pulling a cart of mass 100 kg on a smooth surface and cart is moving with acceleration 3 m/s² in east direction. When person A stops pulling, it moves with acceleration 1 m/s² in the west direction. When person B stops pulling, it moves with acceleration 24 m/s² in the north direction. The magnitude of acceleration of the cart when only A and B pull the cart keeping their directions same as the old directions, is

see full answer

Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!

An Intiative by Sri Chaitanya

$26 m / s^{2}$

$3 \sqrt{71} m / s^{2}$

$25 m / s^{2}$

$30 m / s^{2}$

answer is C.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

When all are pulling

${\bar{F}}_{n e t} = 100 \times 3 \hat{i} . . . . . . . (1)$

when A stops

${\bar{F}}_{n e t} - {\bar{F}}_{A} = 100 \times 1 (- \hat{i}) . . . . . . . (2)$

when B stops

${\bar{F}}_{n e t} - {\bar{F}}_{B} = 100 \times 24 \hat{j} . . . . . . . (3)$

from these three get ${\bar{F}}_{A} + {\bar{F}}_{B} = (700 \hat{i} - 2400 \hat{j}) N$

hence acceleration of the cart

$\begin{array}{l} \vec{a} = \frac{{\bar{F}}_{A} + {\bar{F}}_{B}}{m} = \frac{(700 \hat{i} - 2400 \hat{j})}{100} m / s^{2} \\ \vec{a} = (7 \hat{i} - 24 \hat{j}) m / s^{2} \Rightarrow | \vec{a} | = \sqrt{7^{2} + 24^{2}} = 25 m / s^{2} \end{array}$

Watch 3-min video & get full concept clarity

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th

🔥 Start Your JEE/NEET Prep at Just ₹1999 / month - Limited Offer! Check Now!

Get Expert Academic Guidance – Connect with a Counselor Today!

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Books for IIT JEE

Best Books for NEET

How to Join IIT after 10th