1.

if a body covered first half of journey at a speed of 5 m/s and next half of journey at 15 m/s. Find the average speed.

Answer»

Answer:

A body covers half the distance with a speed of 20 m/s and the other half with a speed of 30 m/s. The average velocity of the body during the whole journey is :

Let the total distance be 2x .For first half distance :Speed is 20 m/s Thus TIME TAKEN t1 = X20 For second half distance :Speed is 30 m/s Thus time taken .



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