Advertisements
Advertisements
Question
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
Solution
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
RELATED QUESTIONS
What do you mean by free fall?
Which force is responsible for the moon revolving round the earth ?
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 ?
What is the usual value of the acceleration due to gravity of earth ?
Explain why, the tip of a sewing needle is sharp.
An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s2
i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest?
The total energy of an object falling freely towards the ground ______.
A force of 10 N acts on a body of mass 5 kg. Find the acceleration produced.
A force acts for 10 s on a stationary body of mass 100 kg, after which the force ceases to act. The body moves through a distance of 100 m in the next 5 s. Calculate : The acceleration produced by the force
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)
A force causes an acceleration of 10 m s-2 in a body of mass 500 g. What acceleration will be caused by the same force in a body of mass 5 kg?
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 force, in newton, your muscles need to apply to hold a mass of 5 kg in your hand? State the assumption.
The value of gravitational acceleration at the centre of earth is zero.
Define acceleration due to gravity.
Write a short note.
Free Fall
Calculate the escape velocity on the surface of the moon given the mass and radius of the moon to be 7.34 × 1022 kg and 1.74 × 106 m respectively.
(Given: G = 6.67 × 10-11 Nm2/kg2)
