The force that the ball exerts on the ground is always equal to the weight of the ball.
The force that the ball exerts on the ground is always equal in magnitude and opposite in direction to
the force the ground exerts on the ball.
The force that the ball exerts on the ground is always less than the weight of the ball.
The weight of the ball is always equal in magnitude and opposite in direction to the force that the
ground exerts on the ball.
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?
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?
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.
to 
in 
. What is the mean resultant force on the object during the change?
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?
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.)
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?
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?
