Acceleration

A positive acceleration means an increase in velocity with time.

What is the physical significance of negative acceleration?

In the given velocity-time graph which segment represent negative acceleration?

At what condition the the cceleration of a body is zero?

Is it possible for a moving object to have zero acceleration?

A cyclist rolls down a hill. He starts from rest and after $8 \mathrm{s}$ he is travelling at $13.6 \mathrm{m}/\mathrm{s}$. Then his acceleration will be $\mathrm{K} \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$. Find the value of $\mathrm{K}$.

If a car is having a uniform motion at $45 \mathrm{km} {\mathrm{hr}}^{-1}$, it's acceleration would be _____.

The fastest acceleration in the animal kingdom is found in the mantis shrimp. It has specialised club-like limbs that it uses to strike its prey. It can accelerate these clubs to speeds of $23 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{$\mathrm{s}$}\right.$ in a time of $0.0027 \mathrm{s}$. Calculate the acceleration (in $\raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$) of its clubs. (Give answer with one decimal part)

Some salamanders have been found to be able to accelerate their tongues at an acceleration of $4000 \mathrm{m} {\mathrm{s}}^{-2}$. The acceleration only lasts for about $0.001 \mathrm{s}$. If their tongue is stationary to begin with, how fast (in $\mathrm{m} {\mathrm{s}}^{-1}$) is their tongue moving after this time?

Which of the following is a vector quantity?

The rate of change of velocity is known as -

Newton's First Law of Motion states that if there is no force is acting on a body then its velocity does not change and the body will not accelerate.

Name the quantity which is defined as the rate of change of velocity.

A ball hits a wall horizontally at $6.0 \mathrm{m} {\mathrm{s}}^{-1}$. It rebounds horizontally at $4.4 \mathrm{m} {\mathrm{s}}^{-1}$. The ball is in contact with the wall for $0.040 \mathrm{s}$. What is the acceleration of the ball?

Which of the following is a unit of acceleration?

Starting from a stationary position, Rahul starts pedalling his bicycle to attain a velocity of $6 \mathrm{m} {\mathrm{s}}^{-1}$ in $30 \mathrm{s}$. Then its acceleration is _____.

A particle moves in x-y plane. The position vector of particle at any time t is $\overrightarrow{\text{r}}=\left\{\text{(2t)}\widehat{\text{i}}+\left({\text{2t}}^2\right)\widehat{\text{j}}\right\}\text{m. }$ The rate of change of θ at time t = 2 s. (where θ is the angle which its velocity vector makes with positive x-axis) is