A ball on which a child sits.
A spring lying on a table.
An elastic band that holds the hair in a ponytail.
A sponge that a student presses hard against the board while wiping the board.
A catapult which my father has in his pocket.
A tarpaulin taut on a trampoline.
elastic energy. How high can we shoot a stone with mass 
? Round off the value to the nearest whole number.
is hung on a spring. In doing so, the spring is stretched by 
.
is placed on a duster to wipe a board. In doing so, the duster is compressed by 
. Does the elastic energy of the duster increase or decrease due to the block on top of it and by how much?
so that it contracts through a distance 
. By how much does the elastic energy of the spring change?
jumps on a trampoline. Calculate the elastic energy transferred to Betty by the trampoline before the jump in each of the two cases below if Betty bounces 
high.
of its elastic energy to Betty.
is dropped from a height of 
. What is the elastic energy of the ball when bouncing off the ground if no energy is lost during the collision?
with an extension of 
from equilibrium. What is the velocity of the mass 
of the arrow immediately after launch if the bow gives it 
its elastic energy? Express the speed in 
and round it off to the nearest whole number.
is stretched with an average force of 
.
is compressed by 1.0 cm.
, 
and 
lie in the same plane on a horizontal surface as shown in the figure below:
. Bodies A and B are tied with a rope so that the spring is compressed by 2.0 cm.
).
is attached to the top of a slope inclined at an angle 
. A log of mass 200 g is attached to the spring and is held so that the spring is not deformed (see the figure below).
which is attached to a wall as shown in the figure below. After the collision of the log with the spring, the spring is compressed by 4.0 cm. What is the speed of the log at the moment it hits the spring if the coefficient of friction between the log and the surface is 0.25? 
and 
are connected in series.
. A force of 32 N is required to extend the spring by 80 cm.
. The spring is compressed by 20 cm and the slope is inclined at an angle 
to the horizontal. When the block is released, it slides towards and up the slope as shown in the figure below.
while the second has a spring constant 
, are stretched to the same length.
is 80 cm long. A block of mass 1.5 kg is attached to the lower end of the spring with the block resting on the ground while the spring is not deformed (see figure). The upper end of the spring is then slowly raised from a height of 80 cm to 170 cm.
to 
. What is the change in the elastic potential energy of the wire caused by the gust of wind?
hangs vertically from a fixed point. A load of weight 
, when hung from the spring, causes an extension 
. The elastic limit of the spring is not exceeded.
with the length 
of the spring is shown in the figure below
.
with the length 
of the spring is shown in the second figure below.
of the spring.
.
of the force 
is shown in the figure below
, of the spring
.
of the force 
acting on a spring is shown in the Fig. 1 below
has one end attached to a fixed point, as shown in the figure below.
is then attached to the spring. The block is then released and begins to move downwards. At one instant, as the block is continuing to move downwards, the spring has a length of 
, as shown in Fig. 3. Assume that the air resistance and the mass of the spring are both negligible. For the change in length of the spring from 
