Two particles of masses m1, m2 move with initial velocities u1 and u2. On collision, one of the particles get excited to higher level, after absorbing energy $$\varepsilon $$. If final velocities of particles be v1 and v2 then we must have :
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 :
