Motion in A Str...

A stone is dropped into the water from a bridge $$44.1 m$$ above the water. another stone is thrown vertically downward $$1 $$second later. both strike the water simultaneously . then initial speed of the second stone is

A bullet moving at 20 m/sec. it strike a wooden plank and pentrates 4 cm before coming to stop. the time taken to stop is 

A particle is dropped from a tower. It is found that it travels  55m in the last second of its journey. Then height of the tower is (g= 10 m/s2g= 10 m/s2) ?

A ball is dropped from a roof to the ground 8.0 m below. A rock is thrown down from the roof 0.6 s later.  If they both hit the ground at the same time, what was the intitial speed of the rock? 

If initial velocity of an object is 'u' and acceleration is 'a' then find the distance travelled in nth second.

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is $$S_1$$ and that covered in the first 20 seconds is $$S_2$$ , then

A body dropped from the top of a tower covers $$7/16$$ of the total height in the last second of its fall. The time of fall is

In this problem 'up' is taken to be positive. A ball thrown vertically upward with an initial velocity of 19.6 $$ \mathrm{m} / \mathrm{s}  $$, after 5 s has a velocity of

What is the angle between instantaneous displacement and acceleration during the retarded motion

A person travelled  a distance of 3 km along a straight line in the North direction .Then he travelled  2 km in west direction and then 5 km in south direction.The magnitude of the displace-ment of this person would be ___________.