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What does the speedometer of a vehicle read/measure

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Important Questions on Kinematics

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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 9
 An athlete completes a circular track of radius 70 metres in 20 s. The average velocity of the athlete is 
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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 10
Out of the followings, which cannot be negative?
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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 11

A fly is in rectilinear motion as described by the graph. The average speed of the fly is

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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 12
If a particle's position is given by x=4-12t+3t2 where t is in the seconds and x in meters. What is its velocity at t=1s? Whether the particle is moving in positive x direction or negative x direction?
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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 13
The stopping distance of a car is 40 m when moving with a speed of 80 km/h. If the car is now moving with 40 km/h, then its stopping distance will be
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Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 14
The displacement of an object at any instant is given by x=30+20t2 , where x is in m and t in s. The acceleration of the object will be
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IMPORTANT
Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 15
A ball is dropped from height 'h'. The velocity attained by ball just before reaching the ground
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IMPORTANT
Physics Crash Course NDA & NA EE>Chapter 3 - Kinematics>Exercise 1>Q 16
All the graphs below are intended to represent the same motion. One of them does it incorrectly. Pick it up.