### Laws of Motion

goals
A life can move upward or downward. A light inextensible string fixed from the ceiling of the lift with a  frictionless pulley and tension in string ${ T }_{ 1 }$. Two masses of ${ m }_{ 1 }$ and ${ m }_{ 2 }$ are connected with inextensible light string and tension in this string ${ T }_{ 2 }$ as shown in the figure. Read the question carefully and answer.
If ${ m }_{ 1 }+{ m }_{ 2 }=m$ and lift is moving with a constant velocity then value of ${ T }_{ 1 }$
In the first second of its flight, rocket ejects 1/60 of its mass with a velocity of 2400 m/s. The acceleration of the rocket is :
A block of mass $m$ is pulled along a horizontal surface by a horizontal rope of mass $1 kg$. A force of $15 N$ is applied at the free end of the rope. The force exerted by the block on the rope is $13.5 N$. the mass $m$ of the block is:
One end of an elastic string is attached to a block of mass m and the other end is held keeping the string relaxed and vertical. Relaxed length of string is $l_0$ and there is a mark P at height $08l_0$ from the lower end. Now the upper end is slowly raised. When the block leaves the contact from ground, the mark P is $0.2l_0$ above the initial position of P. Expression for the work done by the force applied by the hand is?
A block A has a velocity of 0.6 m/s to the right,determ the velocity of cylinder B.