Work And Energy

A. 1600 ms-1
B. 50.6 ms-1
C. 71.6 ms-1
D. 2263ms-1

A. 4.2 km S-1
B. 7.5 km S-1
C. 9.5 km S-1
D. 1.1 km S-1

A. 120 J
B. 60 J
C. 30 J
D. 0.02 J

A. friction
B. electric
C. gravitational
D. magnetic

A. momentum increases 4 times and K.E increases 2 times
B. momentum and K.E. remain same
C. momentum increases 2 times and K.E increases constant
D. momentum increases 2 times and K.E increases 4 time

A. always positive
B. always negative
C. positive only for small frictional force
D. positive only for large frictional force

A. decay of radioactive element in the earth
B. compression of material in the earth
C. residual lost of the earth
D. all as said in A – B and C

A. its mass
B. the angle at which it is thrown
C. both its mass and the angle at which it is thrown
D. gravitational field of earth

A. force into small interval
B. displacement into small interval
C. both force and displacement into small intervals
D. force into small and displacement into large intervals

A. Proton
B. electron
C. neutron
D. a-particle