1
JEE Main 2021 (Online) 22th July Evening Shift
+4
-1
A bullet of '4 g' mass is fired from a gun of mass 4 kg. If the bullet moves with the muzzle speed of 50 ms$$-$$1, the impulse imparted to the gun and velocity of recoil of gun are :
A
0.2 kg ms$$-$$1, 0.1 ms$$-$$1
B
0.4 kg ms$$-$$1, 0.05 ms$$-$$1
C
0.2 kg ms$$-$$1, 0.05 ms$$-$$1
D
0.4 kg ms$$-$$1, 0.1 ms$$-$$1
2
JEE Main 2021 (Online) 20th July Evening Shift
+4
-1
If the Kinetic energy of a moving body becomes four times its initial Kinetic energy, then the percentage change in its momentum will be :
A
100%
B
200%
C
300%
D
400%
3
JEE Main 2021 (Online) 18th March Evening Shift
+4
-1
An object of mass m1 collides with another object of mass m2, which is at rest. After the collision the objects move with equal speeds in opposite direction. The ratio of the masses m2 : m1 is :
A
1 : 1
B
3 : 1
C
2 : 1
D
1 : 2
4
JEE Main 2021 (Online) 17th March Evening Shift
+4
-1
Two identical blocks A and B each of mass m resting on the smooth horizontal floor are connected by a light spring of natural length L and spring constant K. A third block C of mass m moving with a speed v along the line joining A and B collides with A. The maximum compression in the spring is

A
$$\sqrt {{{mv} \over K}}$$
B
$$\sqrt {{m \over {2K}}}$$
C
$$\sqrt {{{mv} \over {2K}}}$$
D
$$v\sqrt {{m \over {2K}}}$$
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