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Motion in A Plane
Question
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What is a projectile and what are the assumptions made in the study of projectile motion? 

Answer

A body projected with some initial velocity and then allowed to fall only under gravity is called a projectile. 
Assumptions made in the study of projectile motion: 
(i) Acceleration due to gravity ‘g’ is constant both in magnitude and direction.
(ii) There is no resistance due to air.
(iii) The earth is flat.
(iv) Rotational motion of the earth is absent.

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Some More Questions From Motion in A Plane Chapter

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

Is a physical quantity, having a direction, necessarily a vector?

Name a quantity which is both scalar as well as vector.

Which of the followings is/are vector quantities: work, power, acceleration, mass, momentum?

Pick up the odd one from the following: force, linear momentum, mass, impulse.

Pick out the only vector quantities in the following list:
Temperature, pressure, impulse, time, power, total path length, energy, gravitational potential, coefficient of friction and charge.

Pick out the two scalar quantities in the following list:
force, angular momentum, work, current, linear momentum, electric field, average velocity, magnetic moment, reaction as per Newton’s third law, relative velocity.

What are polar vectors?

Give two examples of polar vectors.

What are axial vectors?