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1
JEE Main 2021 (Online) 25th July Morning Shift
+4
-1
Two billiard balls of equal mass 30g strike a rigid wall with same speed of 108 kmph (as shown) but at different angles. If the balls get reflected with the same speed then the ratio of the magnitude of impulses imparted to ball 'a' and ball 'b' by the wall along 'X' direction is :

A
1 : 1
B
$$\sqrt 2$$ : 1
C
2 : 1
D
1 : $$\sqrt 2$$
2
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
3
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%
4
JEE Main 2021 (Online) 18th March Evening Shift