A metal ball with the momentum mv strikes a wall and bounces back. The change in the ball's momentum is ideally  ________________

Rocket Engine lift rocket from the earth surface because the hot gas with high velocity  

In the absence of the friction and the other forces, the acceleration of an object is the value of the parallel component divided by the ________________.

kg is the SI unit of   _____________________-

The S.I unit of impulse is ____________________ .

Working of Rocket is based on the principle of __________

A bullet of mass 20 g is fired from a gun of mass 5 kg with a velocity of 150 m. The recoil velocity of the gun is :

Under high impact force , materials break rather than deform because __________________.

If a constant force on a body initially kept at rest, the distance moved by the body in time t is proportional to _____________________.

Two balls of mass 20 kg and 30 kg are moving with speed 5 m/s and 10 m/s in opposite directions towards each other and collide. What will be the magnitude of total momentum of the system before the collision ?