Embibe Experts Solutions for Chapter: Newton's Law of Motion, Exercise 1: Exercise 1

Two blocks of mass $2 \mathrm{kg}$ and $3 \mathrm{kg}$ are placed in a cart. A variable force $F$ is acting on the cart. At an instant acceleration of different blocks and cart are as shown. Find value of $F$ at this instant (mass of cart is $10 \mathrm{kg}$ ) All accelerations are horizontal.

A $2 \mathrm{kg}$ toy car can move along $x$axis. Graph shows resultant force $F_{{\mathrm{x}}^{\text{'}}}$ acting on the car which begins at rest at time $t=0$ The velocity of the particle at $t=10\mathrm{s}$ is:

A bird of mass $400 \mathrm{g}$ is flying horizontally at a certain height with constant acceleration of $5 \mathrm{m} {\mathrm{s}}^{-2}$. The force exerted by surrounding air on the bird has a magnitude $\left(g=10 \mathrm{m} {\mathrm{s}}^{-2}\right)$ 

A mass of $1 \mathrm{kg}$ is suspended by a string $A$. Another string $C$ is connected to its lower end (see figure). If a sudden jerk is given to $C$, then

A diwali rocket is ejecting $0.05\mathrm{kg}$ of gases per second at a velocity of $400 \mathrm{m} {\mathrm{s}}^{-1}$. The accelerating force on the rocket is

A body of mass $2 \mathrm{kg}$ moving on a horizontal surface with an initial velocity of $4 \mathrm{m} {\mathrm{s}}^{-1}$ comes to rest after$2 \mathrm{s}$. If one wants to keep this body moving on the same surface with a velocity of $4 \mathrm{m} {\mathrm{s}}^{-1}$ the force required is

If the tension in the cable of $1000 \mathrm{kg}$ elevator is $1000 \mathrm{kg}$ weight, the elevator

A cork is submerged in water by a spring attached to the bottom of a pail. When the pail is kept in a elevator moving with an acceleration downwards, the spring length