A ball is thrown vertically upwards from the top of a tower with a velocity $u$. This ball reaches the ground level with a velocity $4\,u$. The height of the tower is
A ball is thrown vertically upwards from the top of a tower with a velocity $u$. This ball reaches the ground level with a velocity $4\,u$. The height of the tower is
- A
$\frac{3u^2}{g}$
- B
$\frac{4u^2}{g}$
- C
$\frac{6u^2}{g}$
- D
$\frac{15u^2}{2g}$
Similar Questions
A parachutist after bailing out falls $50\, m$ without friction. When parachute opens, it decelerates at $2\, m/s^2$. He reaches the ground with a speed of $3\, m/s$. At what height, did he bail out ........... $m$
A parachutist after bailing out falls $50\, m$ without friction. When parachute opens, it decelerates at $2\, m/s^2$. He reaches the ground with a speed of $3\, m/s$. At what height, did he bail out ........... $m$
A body, thrown upwards with some velocity reaches the maximum height of $50 \,m$. Another body with double the mass thrown up with double the initial velocity will reach a maximum height of............$m$
A body, thrown upwards with some velocity reaches the maximum height of $50 \,m$. Another body with double the mass thrown up with double the initial velocity will reach a maximum height of............$m$
Two spheres of same size one of mass $2\, kg$ and another of mass $4\, kg$ are dropped simultaneously from the top of Qutab Minar(height $= 72\,m$). When they are $1\,m$ above the ground, the two spheres have the same
Two spheres of same size one of mass $2\, kg$ and another of mass $4\, kg$ are dropped simultaneously from the top of Qutab Minar(height $= 72\,m$). When they are $1\,m$ above the ground, the two spheres have the same
- [AIIMS 2006]
A ball of mass $0.5 \; kg$ is dropped from the height of $10 \; m$. The height, at which the magnitude of velocity becomes equal to the magnitude of acceleration due to gravity, is $\dots \; m$. (Use $g =10 \; m / s ^{2}$).
A ball of mass $0.5 \; kg$ is dropped from the height of $10 \; m$. The height, at which the magnitude of velocity becomes equal to the magnitude of acceleration due to gravity, is $\dots \; m$. (Use $g =10 \; m / s ^{2}$).
- [JEE MAIN 2022]
A parachutist after bailing out falls $20\,\,m$ without friction. When parachute opens, it decelerates at $2\,\,m/s^2.$ He reached the ground with a speed with a speed of $4\,\,m/s.$ At what height, did he bail out ?......$m$
A parachutist after bailing out falls $20\,\,m$ without friction. When parachute opens, it decelerates at $2\,\,m/s^2.$ He reached the ground with a speed with a speed of $4\,\,m/s.$ At what height, did he bail out ?......$m$