An organiser of a bungee jumping competition changes the length of the bungee rope so different people can use the rope safely. Use your idea of forces to describe how the size of a person affects the rope when they jump Extra information- the rope is 15m long, and it extends by 3m when an adult jumps. An adult weighs twice as much as a child. (6 marks QWC)

2b2t

explanation:

2b2t

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

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.