An 87.6 g lead ball is dropped from rest from a height of 7.00 m. the collision between the ball and the ground is totally inelastic. assuming all the ball's kinetic energy goes into heating the ball, find its change in temperature.

Taking specific heat of lead as 0.128 J/gK = c

We have energy of ball at 7.00 meter height = mgh =

When leads gets heated by a temperature ΔT energy needed = mcΔT

                                                                      = ΔT

Comparing both the equations

                      = ΔT

                        ΔT = 0.536 K

                        Change in temperature same in degree and kelvin scale

                                      So ΔT = 0.536

in physics zero. in muscle fatigue could be high

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.