Speed, Velocity and Acceleration

What are all types of acceleration and explain them

A ship moves with a speed of $3 \mathrm{m} {\mathrm{s}}^{-1}$ towards east and then it turned through $90$ degree towards north and covers the same distance with a speed of $4 \mathrm{m} {\mathrm{s}}^{-1}$. Calculate its average speed.

Define uniform velocity and uniform acceleration.

What is Tangential Velocity? Show that the direction of velocity is tangent to the path at a point of interest when a body is in a uniform circular motion.

Explain the differences between average speed and instantaneous speed.

The instantaneous speed of any object is equal to the total distance travelled divided by the total time taken to travel that distance.

Instantaneous speed and average speed are the same.

What is instantaneous speed?

For a body in non-uniform acceleration that velocity does not remain constant. 

What do you mean by non-uniform acceleration?

Assertion: A particle in motion may have variable speed with constant velocity.

Reason: A particle in motion may have non-zero acceleration with constant speed.

In an uniform circular motion, direction of velocity is along the tangent drawn to the position of particle on the _____ of the circle. (Choose from: circumference/ centre/ diameter)

Observe the given picture and identify the direction in which the stone moves after it is released?

Two particles A and B having different masses are projected from a tower with same speed. A is project vertically upward and B vertically downward. On reaching the ground