A car covers the first half of a certain distance with a speed V1 and the second half with a speed V2. Find the average speed during the whole journey.
Correct answer: B. Option B
- A. Option A
- B. Option B
- C. Option C
- D. Option D
- E. Option E
Explanation
Average Velocity = 2V1V2/(V1+V2) Let the total distance be x. So time is taken to cover first half =(x/2)/v1=x/(2v1) Time taken to cover second half=(x/2)/v2=x/(2v2) Now Average velocity=Total Distance/Total time = x/((x/2v1)+(x/2v2)) = 2v1v2/v1+v2
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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