Free Fall

IMPORTANT

Free Fall: Overview

This topic covers concepts, such as, Time Taken in Free Fall, Time Taken in Body Projected Upwards,Free Fall of Bodies and Body Projected Upwards etc.

Important Questions on Free Fall

MEDIUM
IMPORTANT

A body dropped from top of a tower falls 40 m during the last two seconds of its fall. The height of tower is   (g = 10 m s 2 )

EASY
IMPORTANT

A ball is dropped from a high rise platform at, t=0 starting from rest. After 6 s another ball is thrown downwards from the same platform with the speed v. The two balls meet at, t=18 s. What is the value of v(Take, g=10 m s-2 )

MEDIUM
IMPORTANT

Two bodies, A (of mass 1 kg) and B (of mass 3 kg), are dropped from heights of 16 m and 25 m, respectively. The ratio of the times taken by them to reach the ground is

HARD
IMPORTANT

A ball is thrown vertically upwards. It has a speed of 10 m s-1 when it has reached one half of its maximum height. How high does the ball rise?

(Take, g=10 m s-2)

HARD
IMPORTANT

A man throws balls with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw, so that more than two balls are in the air at any time?   [Giveng=9.8 m s 2 ]

EASY
IMPORTANT

A stone is thrown vertically upwards with kinetic energy K. The kinetic energy at the highest point is

EASY
IMPORTANT

If a ball is thrown vertically upwards with a velocity of  40 m s-1 , then velocity of the ball after two seconds will be  (g=10 m s-2)

MEDIUM
IMPORTANT

The water drops fall at regular intervals from a tap 5m above the ground. The third drop is leaving the tap at an instant when the first drop touches the ground. How far above the ground is the second drop at that instant?  (Take g=10m s-2)

MEDIUM
IMPORTANT

A stone released with zero velocity from the top of a tower, reaches the ground in 4 sec. The height of the tower is  (g=10 m s-2)

MEDIUM
IMPORTANT

A body is thrown vertically upward from the ground. It reaches a maximum height of 20 m in 5 sec. After what time, it will reach the ground from its maximum height position?

HARD
IMPORTANT

A body falling freely from a given height 'H' hits an inclined plane in its path at a height 'h'. As a result of this impact, the direction of the velocity of the body becomes horizontal. For what value of hH the body will take maximum time to reach the ground?

EASY
IMPORTANT

A ball is released from the top of a tower of height h metres. It takes T seconds to reach the ground. What is the position of the ball in T 3 seconds?

EASY
IMPORTANT

From a building two balls A and B are thrown such that A is thrown upwards and B downwards (both vertically with same speed). If   v A and   v B are their respective velocities on reaching the ground, then –

EASY
IMPORTANT

If a body is released from certain height then final velocity become

EASY
IMPORTANT

A 0.4 kg mass takes 8 s to reach ground when dropped from a certain height 'P' above surface of earth. The loss of potential energy in the last second of fall is _____ J. [Take g=10 ms-2]

EASY
IMPORTANT

A particle is thrown vertically upward with initial velocity of 150 m s-1. Find the ratio of its speed at t = 3 s and t = 5 s. (Take g=10 m s-2)

MEDIUM
IMPORTANT

A body is projected from ground, vertically upwards travels a distance h in the last second of its total journey. If it is projected with twice the previous velocity, the distance travelled in last second of its journey, is 

MEDIUM
IMPORTANT

A stone starts falling freely under gravity. The time taken by the stone to fall through the initial height h is 4 s. The further time taken to fall through the next 2h height will be closest to

MEDIUM
IMPORTANT

A particle is thrown vertically upwards from the surface of the earth. Let TP be the time taken by the particle to travel from a point P above the earth to its highest point and back to the point P. Similarly, let TQ be the time taken by the particle to travel from another point Q above the earth to its highest point and back to the same point Q. If the distance between the points P and Q is H, find the expression for acceleration due to gravity in terms of TP, TQ and H.

MEDIUM
IMPORTANT

A helicopter ascending at the rate of 12 m s-1 drops a food packet from a height of 80 m above the ground. The time the packet takes to reach the ground is