Motion in A Str...

A stone dropped from a building of height $$h$$ and it reaches after $$h$$ seconds on earth. From the same building if two stones are thrown (one upwards and other downwards) with the same velocity $$u$$ and they reach the earth surface after $$t_1$$ and $$t_2$$ seconds respectively, then 

A particle is moving in a straight line with initial velocity u and uniform acceleration a .If the sum of the distances travelled in $$ t^{th}$$ and $$ (t+1)^{th}$$ seconds is 100 cm, then its velocity after t seconds in $$ cm s^{-1}$$ is 

A balloon of total mass 1000kg float motionless over the earth's surface. If 100kg or sand ballast are thrown over board, the balloon starts to rise with an acceleration of

When a stone falling from the top of the vertical tower has fallen a distance x m, another is let fall from a point y m below the top. If the fall from rest and reach the ground together, then the height of the tower is 

A body travels  $$200\mathrm { cm }$$  in the first two seconds and  $$220\mathrm { cm }$$  in the next four second. The velocity at the end of the seventh second from the start will be (acceleration is constant)

A tiger chases a deer $$30m$$ ahead of it and gains $$3\ m$$ in $$5\ s$$ after the chase began. The distance gained by the tiger in $$10\ s$$ is

Two bodies of masses $$1 kg$$ and $$3 kg$$ obliquely projected in opposite direction towards each other. Their velocities are $$15 ms^{-1}$$ and $$5 \sqrt 3 ms^{-1}$$ and angle made with horizontal are $$30^o$$ and $$60^o$$ respectively. They collide and stick to each other at a point when both of them reach maximum height. What is the final velocity with which the combined mass hits the ground ? $$(g=10 ms^{-2})$$

A particle is falling under gravity. In first $$t$$ second it covers $$s_{1}$$ and in the next $$t$$ seconds it covers $$s_{2}$$ then $$t$$ is given by

To an observer moving along East, the wind appear to blow from North. If the doubles his speed, the air would appear to come from-

A body starting from rest is moving with a uniform acceleration of 8 $$m/{s^2}.$$ Then the distance travelled by it in 5th second will be.