1
JEE Main 2021 (Online) 27th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Three objects A, B and C are kept in a straight line on a frictionless horizontal surface. The masses of A, B and C are m, 2m and 2m respectively. A moves towards B with a speed of 9 m/s and makes an elastic collision with it. Thereafter B makes a completely inelastic collision with C. All motions occur along same straight line. The final speed of C is :

JEE Main 2021 (Online) 27th July Morning Shift Physics - Center of Mass and Collision Question 40 English
A
6 m/s
B
9 m/s
C
4 m/s
D
3 m/s
2
JEE Main 2021 (Online) 25th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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 41 English
A
1 : 1
B
$$\sqrt 2 $$ : 1
C
2 : 1
D
1 : $$\sqrt 2 $$
3
JEE Main 2021 (Online) 22th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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
4
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
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%
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