## Kumar Ketan is teaching live on Unacademy Plus

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18.2k views unacademy Kumar Ketan Educator since January 2018 #6 years teaching experience #IIT JEE Physics #YouTuber (140k+ subs) #Unacademy educator(16k+ lifetimeviews) #Under graduate topper Follow me on the Unacademy Learning App 1k Followers Following Courses Get updates about new courses Watch all my lessons .Download slides and watch offline All courses HINDI Relative Motion (Hindi) Kinematics: Relative Motion Rain Drop and Boat River Proble.. 5.0 (5 ratings) Kumar Ketan Kumar Ketan

CRAs4 Physics course for IIT JEE Kinematics & Dynamics 1D Non-Accelerated Motion 1D Accelerated Motion Force Frictional Force Newton's Law of Motion Relative Motion

ACCELERATED MOTION In non-uniform motion of an object, the velocity of the object is different at different instants, i.e., the velocity of the object keeps on changing with time. Such a motion is said to be an accelerated motion. For example, a vehicle while going from one position to another on a road, moves with different velocities at different instants, hence, it is the illustration of accelerated motion.

In an accelerated motion, if the change in velocity of an object in each unit of time is constant, the object is said to be moving with constant acceleration and such a motion is called uniformly accelerated motion. On the other hand, if the change in velocity in each unit of time is not constant, the object is said to be moving wit variable acceleration and such a motion is called non- uniformly accelerated motion.

ACCELERATION Acceleration of an object in motion is defined as the ratio of change in velocity and the corresponding time taken by the object,i.e., Acceleration - change in velocity/ time taken

Acceleration is a vector quantity. It is positive if the velocity is increasing and is negative if the velocity is decreasing. The negative acceleration is also called a retardation or deceleration The unit of acceleration is in ms 2 in-mks system or SI and cms2 in CGS system. The dimensional formula acceleration is [M LT]

(a)Uniform Acceleration An object is said to be moving with a uniform accel ration if its velocity changes by equal amounts in equal intervals of time.

b) Variable Acceleration An object is said to be moving with a variable acceleration if its velocity changes by unequal amounts in equal intervals of time.

(c) Average acceleration- When an object is moving with a variable acceleration, then the average acceleration of the object for the givern motion is defined as the ratio of the total change in velocity of the object during motion to the total time taken, i.e.,

(d) Instantaneous acceleration when an object is moving with variable acceleration,men the object possesses different accelerations at different instants. The acceleration of the object at a given instant of time or at a given point of motion, is called its instantaneous acceleration.

18.2k views unacademy Kumar Ketan Educator since January 2018 #6 years teaching experience #IIT JEE Physics #YouTuber (140k+ subs) #Unacademy educator(16k+ lifetimeviews) #Under graduate topper Follow me on the Unacademy Learning App 1k Followers Following Courses Get updates about new courses Watch all my lessons .Download slides and watch offline All courses HINDI Relative Motion (Hindi) Kinematics: Relative Motion Rain Drop and Boat River Proble.. 5.0 (5 ratings) Kumar Ketan Kumar Ketan

Or 6-u 2a (24 + 64) = u 8 + a 82-8u + 32a Or 11u 4a On solving (1) and (2), we get u 1 m/s

Hence., t1 -2s ; . v 3 x 2 6 m/s As S-ut + at2 S2 = 6x 1 + (-6) 12 = 6-3,m

A particle moving in a straight line with initial velocity u and uniform acceleration f. If the sum of the distances travelled in t th and (t+1)th seconds in 100 cm, then its velocity after t seconds in cm/s is (a)20 (b) 30 (c) 50 (d) 80

Ort2 - 10t -25 0 On solving we get, t (5 t . t- (5+5V2) sec 5v2) sec