Hola tengo un taller de física y nose como resolver este pregunta
Un tren arranca con una velocidad constante de 250km/h si su aceleración es de 190km/h² calcular el tiempo y distancia
Es urgente tengo 5 tareas más

a) 0.26 h

b) 71.4 km

Explanation:

a)

In order to solve the problem, we have to know what is the final velocity of the car.

Here, we assume that the final velocity reached by the car is

Therefore, we can find the time taken by the car to reach this velocity by using the suvat equation:

where:

u = 250 km/h is the initial velocity

is the acceleration of the car

v = 300 km/h is the final velocity

t is the time

Solving for t, we find:

b)

In order to find the distance covered by the car, we can use the following suvat equation:

where:

s is the distance covered

u is the initial velocity

a is the acceleration

t is the time

For the car in this problem, we have:

u = 250 km/h

t = 0.26 h (calculated in part a)

Therefore, the distance covered is

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.