You can only unlock the chapter using a special code that we will send you via the Viber app. Receiving a message is free of charge and with no obligations.
My phone number:
Get a code
In compliance with the law, persons under the age of 15 can enter their phone number only in the presence of a parent or guardian.
4-character code:
Check the received code
The page will be refreshed automatically in a few seconds.
To ensure the proper functioning of the website, OpenProf uses cookies that do not store personal data. By continuing to use the website, you agree to cookies. Tell me more »
and bounces off elastically. The absolute value of the velocity after collision is equal to the absolute value of the velocity before collision. With what impulse did the wall act on the ball?
and at an angle 
with respect to the vertical. It is elastically reflected from the wall so that the reflecting angle is equal to the incident angle. The absolute value of the speed after reflection is equal to the absolute value of the speed before reflection. With what impulse did the wall act on the ball?
into a stationary wooden log weighing 8 kg and remains in the log. What is the force impulse of the bullet on the log and that of the log on the bullet?
in the horizontal direction at a speed of 
relative to the ground. The mass of the skater is 
.
after the throw?
drives onto a ferry at a speed of 
, brakes evenly and stops after covering a distance of 
. What is the force impulse on the rope with which the ferry is attached to the shore?
is thrown horizontally with a speed of 
against a vertical wall. The ball is in contact with the wall for a time of 
before rebounding back along its original path with a speed of 
. What is the average force exerted by the wall on the ball during the collision?
travelling horizontally with velocity 
hits a vertical wall at right angles to the wall. It then rebounds horizontally with the same speed. What is its change in momentum?
collides with a stationary body with mass 
. The collision is elastic. After the collision, the body with mass 
has kinetic energy 
.
after the collision and the initial velocity before the collision?
and at speed 
lands in a stationary log with mass 
on a horizontal smooth surface. The projectile collision with the log is central. The projectile stops in the log after 
as shown in the figure below.
moving with a velocity 
collides with a stationary body of the same mass. If the collision is inelastic, how much of the kinetic energy is converted into internal energy?
is travelling at 
towards a car of mass 
travelling at 
towards the lorry.
and the mass of the cannon ball is 
. The recoil velocity of the cannon is 
horizontally. What is the horizontal velocity of the cannon ball?
is thrown against a wall at a speed of 
. It bounces back with a speed of 
. The collision lasts for 
.
is struck by a tennis racket. The velocity of the ball is changed as shown.
is dropped onto a hard surface from a height 
and rebounds to a height 
. The momentum of the golf ball just as it reaches the surface is different from its momentum just as it leaves the surface. What is the total change in the momentum of the golf ball between these two instants? (Ignore air resistance.)
to 
in 
. What is the mean resultant force on the object during the change?
