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1
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+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 :

JEE Main 2021 (Online) 25th July Morning Shift Physics - Center of Mass and Collision Question 29 English
A
1 : 1
B
$$\sqrt 2 $$ : 1
C
2 : 1
D
1 : $$\sqrt 2 $$
2
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+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
MCQ (Single Correct Answer)
+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
MCQ (Single Correct Answer)
+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
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