Embibe Experts Solutions for Chapter: Laws of Motion, Exercise 8: Exercise (Previous Year Questions)

A person of mass $60kg$ is inside a lift of mass $940kg$ presses the button on the control panel. The lift starts moving upwards with an acceleration of $1·0m/s^2$. If $g=10m/s^2$, the tension in the supporting cable is

In the following diagram find value of $T_2$.

A train has $10$ wagons each of mass $1000 \mathrm{kg}$ attached to it. They are being pulled by force ${10}^4 \mathrm{N}$. Find out the force exerted on the last four wagons.
                                                                         

If $m_1=m_2=1 \mathrm{kg}$ then find out the distance travelled by $m_1$ in the first $\frac{1}{2}$ second. 

A body of $1000 \mathrm{kg}$ moving with $0.3 \mathrm{m} {\mathrm{s}}^{-1}$ in $+x$ direction. A hole is present at the bottom of the body such that, mass is dropping at a rate of $20 \mathrm{g} {\sec }^{-1}$, in $-y$ direction. Find out the force exerted by ejecting mass on the body. 

Two blocks $A$ and $B$ of masses $3m$ and $m$ respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in the figure. The magnitudes of acceleration of $A$ and $B$ immediately after the string is cut, are respectively:-

Force of $3 \mathrm{N}$ acts on a system of two blocks of mass $2 \mathrm{kg}$ and $1 \mathrm{kg}$ as shown in the figure. The contact force between the blocks is:
 

Water jet is coming out of a hosepipe of diameter $20 \mathrm{cm}$ with speed $20 \mathrm{cm} {\mathrm{s}}^{-1}$. It strikes a man inelastically. Find the force exerted by the water jet on the person.