Two identical cars are driving in opposite directions at the same speed. their kinetic energies have . different magnitudes and opposite signsb. different magnitudes, but the same signc. the same magnitude and signd. the same magnitude, but opposite signs

The kinetic energies have the same magnitudes and signs. (c)

Why?

To answer the question, we need to remember the equation to calculate the kinetic energy of a body.

From the equation, we can see that no matter the direction of the movement, if we square the speed, we will get a positive value, so, it means that the kinetic energy will be always positive. Remember, the kinetic energy is not a vector but a scalar value.

Now, from the statement we know that both cars are identical (both have the same mass) and both are moving at the same speed, it means that the kinetic energies for the two cars will have the same magnitude and the same sign.

Have a nice day!

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

can u provide the graph and if its not possible

then i can tell u the segment where the

average time interval starts degrading is the segment where the car is slowing down