Forces and Laws...

A rocket with a lift-off mass $$3.5\times {10}^{4}\ kg$$ is blasted upwards with an initial acceleration of $$10m{s}^{-2}$$. Then the initial thrust of the blast is:

A gun weighing $$10\ kg$$ fires a bullet of $$30\ g$$ with a velocity $$330\ m/s$$ With what velocity does the gun recoil?

The velocity acquired by a mass $$m$$ in travelling a certain distance $$d$$ starting from rest under the action of a constant force is directly proportional to:

According to Newton's third law action is always equal and opposite to the reaction, a horse can pull a cart because it applies a ______.

A $$10\ N$$ force applied on a body produces in it an acceleration of $$2\ m{ s }^{ -2 }$$. The mass of the body is 

Fill in the blanks.
At least _____________ objects must be present to experience a gravitational force. 

Swimming is based on Newton's:

Which of the following objects experience balanced forces? 

A person holding a rifle (mass of person and rifle together is 100 kg) stands on a smooth surface and fires 10 shots horizontal, in 2 s. Each bullet has a mass of 10 g with a muzzle velocity of $$800{ ms }^{ -1 }.$$ The final velocity acquired by the person and the average force exerted on the person are

A force of 15N acts separately on two bodies of masses 3kg and 5kg. The ratio of the acceleration produced in the two cases will be