Motion in a Str...

A train has a speed of 60 km/hr. for the first one hour and 40 km/hr. for the next half hour. Its average speedin km/hr. is

Which of the following is a one dimensional motion

A 150 m long train is moving with a uniform velocity of 45 km/hr. The time taken by the train to cross a bridge of length 850 m is

A particle is constrained to move on a straight line path if returns to the starting point after 10 sec. The total distance covered by the particle during this time is 30 m. Which of the following statements about the motion of the particle is false

A man walks on a straight road from his home to a market 2.5 km away with a speed of 5 km/hr. Finding the market closed, the instantly turns and walks back home with a speed of 7.5 km/hr. The average speed of the man over the interval of time 0 to 40 min. is equal to

If a car covers 2/5th of the total distance with v₁ speed and 3/5th distance with v₂ then average speed is

Two boys are standing at the ends A and B of a ground where AB = a. The boy at B starts running in a direction perpendicular to AB with velocity v₁. The boy at A starts running simultaneously with velocity v and catches the other boy in a time t, where t is

A particle covers half of its total distance with speed v₁ and the rest half distance with speed v₂. Its average-speed during the complete journey is

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is S₁. and that covered in the first 20 seconds isS₂, then