Two blocks A and B of mass 2kg and 3 kg respectively are connected with the help of a mass less, in extensible string passing over a smooth pulley as shown, the system is released from rest at t= 0, then (take g=10 m/sec2). Find acceleration of blocks?

Given,

Two blocks A and B of mass 2kg and 3 kg respectively are connected with the help of a mass less, in extensible string passing over a smooth pulley as shown, the system is released from rest at t= 0, then (take g=10 m/sec2). 

a. Find acceleration of blocks?

b. If at t= 1 sec, block B is stopped momentarily and released , after how much time will the string become tight again?

c. What will be the velocity of the blocks, just after the string become tight ?

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On piercing through a distance of 15 cm in a wooden block, a bullet loses half of its initial velocity. Before coming to rest the further distance travelled by it is?

Given,

On piercing through a distance of 15 cm in a wooden block, a bullet loses half of its initial velocity. 

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A lorry and a car, moving with the same kinetic energy are stopped by equal retarding forces. Which one of them will be stopped in a shorter distance?

Given,

A lorry and a car, moving with the same kinetic energy are stopped by equal retarding forces.

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An object is resting at the bottom of two strings which are inclined at an angle of 120 degrees with each other. Each string can withstand a tension of 20 N. The maximum weight of the object that can be supported without breaking the string is?

Given,

An object is resting at the bottom of two strings which are inclined at an angle of 120 degrees with each other. Each string can withstand a tension of 20 N. 

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A man weighing 80 kg is standing on a trolley weighing 320 kg. The trolley is resting on a friction less horizontal rails. If the man starts walking on the trolley along the rails at speed 1 m/s. Then after 4 sec his displacement relative to ground will be ?

Given,

A man weighing 80 kg is standing on a trolley weighing 320 kg. The trolley is resting on a friction less horizontal rails. If the man starts walking on the trolley along the rails at speed 1 m/s. Then after 4 sec his displacement relative to ground will be 

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