Mansi Garg and Jitendra Kumar Solutions for Chapter: Laws of Motion, Exercise 4: CHAPTER EXERCISE

If a net horizontal force of $130 \mathrm{N}$ is applied to a person with mass $60 \mathrm{kg}$ who is resting on the edge of a swimming pool, what horizontal acceleration is produced?  

A certain force exerted for $1.2 \mathrm{s}$ raises the speed of an object from $1.8 \mathrm{m}/\mathrm{s}$ to $4.2 \mathrm{m}/\mathrm{s}$. Later, the same force is applied for $2 \mathrm{s}$. How much does the velocity change in $2 \mathrm{s}$?

A bus starts from the stop and take $50 \mathrm{s}$ to get the speed of  $10 \mathrm{m}/\mathrm{s}$. If the mass of the bus along with the passengers is $10000 \mathrm{kg}$, calculate the force applied by the engine of the bus to push the bus at the speed of $10 \mathrm{m}/\mathrm{s}$.

A constant force acts on an object of $5 \mathrm{kg}$ for a period of $2 \mathrm{s}$. It increases the velocity of an object from $3 \mathrm{m}/\mathrm{s}$ to $7 \mathrm{m}/\mathrm{s}$. Find the magnitude of the applied force. Now, if the force was applied for a period of $5 \mathrm{s}$, what would be the final velocity of the object?

The speed-time graph of a car of $1000 \mathrm{kg}$ mass is given. On the basis of this, answer the following question.

What is the maximum force acting on the car?

The speed-time graph of a car of $1000 \mathrm{kg}$ mass is given. On the basis of this, answer the following question.

What is the retarding force acting on the car?

The speed-time graph of a car of $1000 \mathrm{kg}$ mass is given. On the basis of this, answer the following question.

For how long is no force is acting on the car?

The speed-time graph of a car of $1000 \mathrm{kg}$ mass is given. On the basis of this, answer the following question.

What is the velocity of the car from $4 \mathrm{s}$ to $8 \mathrm{s}$?