1
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1

If momentum of a body is increased by 20%, then its kinetic energy increases by

A
36%
B
40%
C
44%
D
48%
2
JEE Main 2022 (Online) 29th July Evening Shift
+4
-1

The torque of a force $$5 \hat{i}+3 \hat{j}-7 \hat{k}$$ about the origin is $$\tau$$. If the force acts on a particle whose position vector is $$2 i+2 j+k$$, then the value of $$\tau$$ will be

A
$$11 \hat{i}+19 \hat{j}-4 \hat{k}$$
B
$$-11 \hat{i}+9 \hat{j}-16 \hat{k}$$
C
$$-17 \hat{i}+19 \hat{j}-4 \hat{k}$$
D
$$17 \hat{i}+9 \hat{j}+16 \hat{k}$$
3
JEE Main 2022 (Online) 29th July Morning Shift
+4
-1

Two bodies of mass $$1 \mathrm{~kg}$$ and $$3 \mathrm{~kg}$$ have position vectors $$\hat{i}+2 \hat{j}+\hat{k}$$ and $$-3 \hat{i}-2 \hat{j}+\hat{k}$$ respectively. The magnitude of position vector of centre of mass of this system will be similar to the magnitude of vector :

A
$$\hat{i}+2 \hat{j}+\hat{k}$$
B
$$-3 \hat{i}-2 \hat{j}+\hat{k}$$
C
$$-2 \hat{i}+2 \hat{k}$$
D
$$2 \hat{i}-\hat{j}+2 \hat{k}$$
4
JEE Main 2022 (Online) 28th July Morning Shift
+4
-1

In two different experiments, an object of mass $$5 \mathrm{~kg}$$ moving with a speed of $$25 \mathrm{~ms}^{-1}$$ hits two different walls and comes to rest within (i) 3 second, (ii) 5 seconds, respectively. Choose the correct option out of the following :

A
Impulse and average force acting on the object will be same for both the cases.
B
Impulse will be same for both the cases but the average force will be different.
C
Average force will be same for both the cases but the impulse will be different.
D
Average force and impulse will be different for both the cases.
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