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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If a particle takes t second less and acquires a velocity of v m/s more in falling through the same distance on two planets where the acceleration due to gravity are 2g and 8g respectively, then find the relation between v and t?

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A sphere of mass m is dropped from a height h above the ground. On reaching the ground it penetrates through a distance S in sand and finally stops. The average resistance offered by the sand to oppose the motion is?

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From the top of tower, a stone is thrown up. It reaches the ground in t1 sec. A second stone thrown down with the same speed reaches the ground in t2 sec. A third stone released from rest reaches ground in t3 sec. Then find the relation between t1, t2 and t3?

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A ball is dropped from a bridge of 122.5 meters above a river. After the ball has been falling for two seconds, a second ball is thrown straight down after it. If both hit the water simultaneously, then the initial velocity of second ball should be?

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A point mass with uniform acceleration and v1, v2, v3 denotes the average velocities in the three successive internals of time t1, t2, t3. What is the relation between v1, v2, v3 and t1, t2, t3?

Answer:

When a body is projected vertically up from the ground, its velocity is reduced to 1/3rd of its initial velocity at height y above the ground. The maximum height reached by the body is?

Answer is given below :

A ball is projected upwards from ground. It is observed from a 73.5m high window, twice at the interval of 2s. What is the velocity of projection of the ball?

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A lift is going up. The variation in the speed of the lift is as given in the graph. What is the height to which the lift takes the passengers, What will be the average velocity of the lift,What is the Average acceleration of the lift?

 A lift is going up. The variation in the speed of the lift is as given in the graph.

 

1. What is the height to which the lift takes the passengers?

2. What will be the average velocity of the lift?

3. What is the Average acceleration of the lift?