Advertisements
Advertisements
प्रश्न
A ball falls off a table and reaches the ground in 1 s. Assuming g=10 m/s2, calculate its speed on reaching the ground and the height of the table.
Advertisements
उत्तर
1) Velocity on reaching the ground
v = u + gt
v = final velocity
u = initial velocity
t = time
g = gravitational acceleration.
Doing the substitution we have :
v = 0 + 10 × 1 = 10 m/s
= 10 m/s
2) The height of the table
S = ut + 1/2gt²
Doing the substitution we have :
S = 0 × 1 + 1/2 × 10 × 1
s = 0 + 5
= 5 meters
APPEARS IN
संबंधित प्रश्न
What do you mean by free fall?
When an object is dropped from a height, it accelerates and falls down. Name the force which accelerates the object.
What do you mean by the term free fall ?
Give reason for the following :
The force of gravitation between two cricket balls is extremely small but that between a cricket ball and the earth is extremely large.
Explain why, if a stone held in our hand is released, it falls towards the earth.
Name the force which wears away two surfaces as they move over one another.
Name the force which stops you falling through the floor.
The value of acceleration due to gravity of earth :
The acceleration produced in a body by a force of given magnitude depends on
A force of 15 N acts on a body of mass 2 kg. Calculate the acceleration produced.
Figure shows the velocity-time graph of a particle of mass 100 g moving in a straight line. Calculate the force acting on the particle.
(Hint : Acceleration = Slope of the v-t graph)
How is the acccelaration due to gravity on the surface of the earth realted to its mass and radius ?
A body falls freely under gravity from rest and reaches the ground in time t. Write the expression for the height fallen by the body.
A body is projected vertically upward with an initial velocity u . If acceleartion due to gravity is g , the time for which it remains in air , is :
What is the acceleration due to gravity?
In vacuum, all freely falling objects have the same force. Is it true?
Explain why:
Objects fall to the earth.
Write scientific reason.
The value of gravitational acceleration (g) decreases as we go deep inside the earth.
Write scientific reason.
When we drop a feather and a stone at the same time from a height the stone reach the earth faster than a feather.
Write scientific reason.
The value of gravitational acceleration (g) is taken to be -g when studying the motion of an object thrown upwards in a straight line.
