AYUDA POR FAVOR :( Una motocicleta parte de la línea de salida y aumenta repentinamente su velocidad a 72 km/h en 20 s.
Determinar su aceleración media.
La siguiente es la gráfica de x - t, correspondiente al movimiento de un cuerpo que describe una trayectoria rectilínea.

a. ¿Cuál es la distancia total recorrida y el desplazamiento total realizado por el cuerpo durante el movimiento?
b. ¿Cómo es el movimiento del cuerpo entre los 4 y los 6 segundos?
c. ¿Cuál es la rapidez media y la velocidad media del cuerpo entre los 4 y los 14 segundos?
d. ¿En qué intervalos de tiempo la velocidad es negativa? ¿Qué significado tiene?

d₁ = displacement of tern from arctic to antarctic = 11000 miles

d₂ = displacement of tern from antarctic to arctic =   - 11000 miles

d = total displacement for the journey

total displacement for the journey is given as

d = d₁ + d₂

d = 11000 + (-11000)

d = 0 miles

t₁ = time of travel from arctic to antarctic = 3 months = 3 x 30 days = 90 days

t₂ = time of travel from antarctic to arctic = 3 months = 3 x 30 days = 90 days

t = total time of travel

total time of travel is given as

t = t₁ + t₂

t = 90 + 90

t = 180 days

average velocity is given as

average velocity = total displacement/ total time

v = d/t

v = 0/180

v = 0 miles/day

radiation

explanation:

heat is transmitted by radiation

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.