Two spherical bodies of mass M and 5M and radii R and 2R are released in free space with initial separation between their centres equal to 12R. If they attract each other due to gravitational force only, then the distance covered by the smaller body before collision is :
A
7.5R
B
1.5R
C
2.5R
D
4.5R
2
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
The force F acting on a particle of mass m is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8 s is :
A
24 N s
B
20 N s
C
12 N s
D
6 N s
3
AIPMT 2014
MCQ (Single Correct Answer)
+4
-1
A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass (m) move perpendicular to each other with equal speeds (v). The total kinetic energy generated due to explosion is :
A
mv2
B
$${3 \over 2}$$mv2
C
2mv2
D
4mv2
4
NEET 2013 (Karnataka)
MCQ (Single Correct Answer)
+4
-1
A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontally, in 5 s. Each bullet has a mass of 10 g with a muzzle velocity of 800 m s$$-$$1. The final velocity acquired by the person and the average force exerted on the person are :
