The mass of a large car is 1000kg. if the car starts from rest and reaches a velocity of 24.6 meters per second with a constant acceleration in 2 minutes. what's the acceleration?

1 minute = 60 seconds

2 minutes =120 seconds

(24.6 meters/sec) / (120 sec) = 0.205 meter/sec² = about 0.021 of a 'G'.

The mass of the car is irrelevant, in order to go just this far.

If you want to go a little farther, you can calculate the average force on the car, since you do know its mass.

Force = (mass) x (acceleration) = (1,000 kg) x (0.205m/s²) = 205 newtons

That's about 46 pounds of force accelerating the car . . . not a very powerful engine for a car that weighs more than a ton.

an energy transformation flow diagram is shown

where is it ?

the minimum constant speed at which she can catch the train is 2.7 m/s

given:

acceleration = 0.6

time = 4.5 s

to find:

velocity = ?

formula used:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

solution:

from 1st kinematic equation we get,

v = u + at

u = initial speed of train = 0 m/s

v = final speed of the train

a = acceleration of the train

t = time

v = 0 + (0.6 × 4.5)

v = 2.7 m/s

the minimum constant speed at which she can catch the train is 2.7 m/s