A block is moved on a straight line with a speed of `5m^(-1)` towards a wall laying 20m away. After collision with wall, block retraces the path with a speed of `4ms^(-1)`. What is the average velocity of block during the time interval 0 to 6 sec?

A bullet of mass 0.06 kg moving with a speed of 90ms^(-1) enters a heavy wooden block and it stopped after a distance of 60 cm. What is the average resistive force exerted by the block on the bullet ?

A bullet of mass 0.04 kg moving with a speed of 90 ms^(-1) enters a heavy wooden block and is stooped after a distance of 60 cm . What is the average resistive force exerted by the block on the bullet ?

System is shown in fig. and wedge is moving toward left with speed 2ms^(-1) . Find the velocity of the block B.

A block of mass 10 kg accelerates uniformly from rest to a speed of 2 m/s in 20 sec. The average power developed in time interval of 0 to 20 sec is

A ball of mass 0.50 kg moving at a speed of 5.0 m/s collides with another ball of mas 1.0 kg. After the collision the balls stick together ane remain motionless. What was the velocity of the 1.0 kg block before the collision?

A hammer of mass 1 kg moving with a speed of 6 ms^(-1) strikes a wall and comes to rest in 0.1 sec. Calculate Average retardation of the hammer

A person walks a distance of "30m" towards east with a speed of 2ms^(-1) and, 40m" towards north with a speed of 3/2ms^(-1) .The average speed and average velocity for his journey is

A block of mass 1 kg moving with a speed of 4 ms^(-1) , collides with another block of mass 2 kg which is at rest. If the lighter block comes to rest after collision, then the speed of the heavier body is

A spring-block system is resting on a frictionless floor as shown in the figure. The spring constant is 2.0Nm^(-1) and the mass of the block is 2.0 kg. Ignore the mass of the spring. Initially the spring is in an unstretched condition. Another block of mass 1.0 kg moving with a speed of 2.0ms^(-1) collides elastically with the first block. The collision is such that the 2.0 kg block does not hit the wall. The distance, in metres, between the two blocks when the spring returns to its unstretched position for the first time after the collision is

A body moving along a straight line travels one third of the total distance with a speed of 3.0 m s^(-1) . The remaining distance is covered with a speed of 4.0 m s^(-1) for half the time and 5.0 m s^(-1) for the other half of the time. The average speed during the motion is