Motion in A Str...

A stone $$A$$ is thrown vertically upward with speed $$u$$ and another stone $$B$$ is thrown vertically downward with same speed $$u$$ from a height $$h$$. The time taken by stone $$A$$ and $$B$$ to reach the ground are $$16\ s$$ and $$4\ s$$ respectively. The time taken by another stone to reach the ground after it has been dropped from height $$H$$ is [Take $$g=10\ m/s^{2}$$]

Two persons start running towards each other from two points that are 120 m apart. First person runs with a speed of $$5\;m{s^{ - 1}}$$ and the other with a speed of $$7\;m{s^{ - 1}}$$.Both the persons meet after 

A particle slides down a smooth inclined plane of elevation $$\theta$$ fixed in the elevator going up with an acceleration $$a_0$$ as shown. The base of the incline has length $$L$$. Then the time taken by the particle to reach the bottom of the plane is given by:

Balls are dropped from the roof of a tower at a fixed interval of time. At the moment when $$9 ^ { \text { th } }$$ ball reaches the ground $$\mathrm { n } ^ { \text { th } }$$ ball is at $$3 / 4 ^ { \text { th } }$$ height of tower. The value of $$n$$ is:

A stone thrown upwards with a velocity u reaches upto a height h. If the initial velocity is 2u the height attained would be

A clean body of mass $$100\  g$$ starts moving with a velocity of $$2\ m/s$$ on a smooth horizontal plane and it accumulates dust at the rate of $$5\ g/s$$ . The velocity of body after $$20\ s$$ will be 

A body moves with a velocity of 3 m/s due east and then turns due north to travel with the same velocity. If the total time of travel is 6s, the acceleration of the body 

Burglars, after looting a bank, jump into a waiting van at rest and speed up along a straight road at a constant rate of $$2.0{\text{ m}}{{\text{s}}^{ - 2}}$$ . At that instant, a police jeep moving at a constant speed of 30 m/s is 300m behind the burglars moving in the same direction. Choose the correct statement from the following;

A ball is dropped freely while another is thrown vertically downward with an initial velocity of $$\dfrac{v}{2}$$ from the same point simultaneously. After 't' second they are separated by a distance of?

A rocket is projected at the surface of earth like that in which acceleration 19.6 $$m/s^{2}$$ produces. After 5 seconds if stops its engine then calculate the following before to come at the surface of the earth.