A 2,400 kg car drives north toward a 60 kg shopping cart that has a velocity of zero. The two objects collide, giving the car a final velocity of 4.33 m/s north and the shopping cart a velocity of 8.88 m/s north. What was the initial velocity of the car ?

A 4.55 m/s north

Explanation:

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

not too sure thinking all accelerations are pointed down