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Water drops fall at regular intervals from a tap which is $5 \text{ m}$ above the ground. The third drop is leaving the tap at the instant the first drop touches the ground. How far above the ground is the second drop at that instant?
A stone is thrown vertically downwards with an initial velocity of $40 \text{ m/s}$ from the top of a building. If it reaches the ground with a velocity of $60 \text{ m/s}$, then the height of the building is: (take $g=10 \text{ m/s}^2$)
Velocity of a body on reaching the point from which it was projected upwards, is:
The ratio of the distances travelled by a freely falling body in the 1st, 2nd, 3rd and 4th second is:
An object falls freely from height $h$ above the ground. It travels $\frac{5}{9}h$ of the total height in the last $1\text{ s}$. The height $h$ is: (use $g=10\text{ m/s}^2$)
A vehicle travels half the distance with speed $v$ and the remaining distance with speed $2v$. Its average speed is:
The speed of a car as a function of time is shown in the figure. The distance travelled by the car in 8 s is:
A particle is thrown vertically upwards. If its velocity at half of the maximum height is $10 \text{ m/s}$, then maximum height attained by it is (Take $g = 10 \text{ m/s}^2$):
A stone is thrown with an initial speed of $4.9 \text{ m/s}$ from a bridge in vertically upward direction. It falls down in water after $2 \text{ sec}$. The height of the bridge is:
A body is thrown vertically up from the ground. It reaches a maximum height of $100 \text{ m}$ in $5 \text{ s}$. After what time will it reach the ground from the position of maximum height?
A stone dropped from the top of the tower touches the ground in $4 \text{ sec}$. The height of the tower is about:
A cricket ball is thrown up with a speed of $19.6 \text{ ms}^{-1}$. The maximum height it can reach is:
From the top of a tower, a particle is thrown vertically downwards with a velocity of $10 \text{ m/s}$. The ratio of the distances, covered by it in the 3rd and 2nd seconds of the motion is (Take $g=10 \text{ m/s}^2$):
The incorrect statement about the property of a Zener diode is:
A $12\text{ V}$, $60\text{ W}$ lamp is connected to the secondary of a step-down transformer, whose primary is connected to ac mains of $220\text{ V}$. Assuming the transformer to be ideal, what is the current in the primary winding?
The effective acceleration of a body, when thrown upwards with acceleration $a$ (in a frame moving with acceleration $a$) will be:
A police jeep is chasing with a velocity of $45 \text{ km/h}$ a thief in another jeep moving with a velocity of $153 \text{ km/h}$. Police fire a bullet with a muzzle velocity of $180 \text{ m/s}$. The velocity with which it will strike the car of the thief is:
A $120 \text{ m}$ long train is moving in a direction with speed $20 \text{ m/s}$. A train B moving with $30 \text{ m/s}$ in the opposite direction and $130 \text{ m}$ long crosses the first train in a time:
Two balls are dropped from heights h and 2h respectively from the earth surface. The ratio of time of these balls to reach the earth is:
A body is released from the top of a tower of height $h$. It takes $t$ sec to reach the ground. Where will be the ball after time $t/2$ sec?