Questions in Motion in A Straight Line

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\[P,\,Q\] and \[R\] are three balloons ascending with velocities \[U,\,4U\] and \[8U\] respectively. If stones of the same mass be dropped from each, when they are at the same height, then
A body is projected up with a speed \['u'\] and the time taken by it is \[T\] to reach the maximum height \[H\]. Pick out the correct statement
A body falling for 2 seconds covers a distance \[S\] equal to that covered in next second. Taking \[g = 10\,m/{s^2},\,S = \]
A body dropped from a height \[h\] with an initial speed zero, strikes the ground with a velocity\[3\,km/h\]. Another body of same mass is dropped from the same height \[h\] with an initial speed \[ - u' = 4km/h\] . Find the final velocity of second body with which it strikes the ground
A ball of mass \[{m_1}\] and another ball of mass \[{m_2}\] are dropped from equal height. If time taken by the balls are \[{t_1}\] and \[{t_2}\] respectively, then
With what velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second \[(g = 10\,m/{s^2})\]
A body sliding on a smooth inclined plane requires 4 seconds to reach the bottom starting from rest at the top. How much time does it take to cover one-fourth distance starting from rest at the top
A ball is dropped downwards. After 1 second another ball is dropped downwards from the same point. What is the distance between them after 3 seconds
A stone is thrown with an initial speed of 4.9 m/s from a bridge in vertically upward direction. It falls down in water after 2 sec. The height of the bridge is
A stone is shot straight upward with a speed of 20 m/sec from a tower 200 m high. The speed with which it strikes the ground is approximately

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