Question Text
Question 2 :
Name the type of energy (kinetic energy $K$ or potential energy $U$) possessed in a compressed spring:
Question 4 :
A body of mass $ m_1 $ moving with a velocity 10 m/s collides elastically with another body at rest of mass $ m_2 $. After collision the velocites of the two bodies are 2 m/s and 5 m/s respectively along the direction of motion of $ m_1 $. The ration of $ \dfrac { m_ {1} }{ m_ {2} }  is $
Question 5 :
A man of mass $50kg$ climbs up a ladder of height $10m$. Calculate the increase in his potential energy. $(g=9.8ms^{-2})$
Question 7 :
 A bullet of mass 20 gm is fired from a rifle of mass 20 kg with a muzzle velocity of $200\ ms^{-1}$. Find the velocity of recoil of the rifle.<br/>
Question 8 :
A gun of mass $50$ $kg$ fires a bullet of mass $0.5$ $kg$ with velocity of $200ms^{-1}$. If the gun moves through $1$ $m$ back before coming to rest, the frictional force on the gun is:
Question 9 :
Water in the waterfall flows from a higher level to the lower level because.
Question 10 :
A 10 kg ball moving with velocity 2 m/s collides with a 20 kg mass initially at rest. If both of them coalesce, the final velocity of combined mass is:
Question 11 :
A ball is thrown horizontally from the top of a tower $40$m high. The ball strikes the ground at a point $80$m from the bottom of the tower. Find the angle that the velocity vector makes with the horizontal just before the ball hits the ground.
Question 12 :
Two small spheres of equal mass, and heading towards each other with equal speeds, undergo a headon collision (no external force acts on system of two spheres). Then which of the following statement is correct?<br>