In the graph, a sample of water is heated from 40 degrees celsius to 100 degrees celsius. which statement correctly describes the curve? a) qr- liquid only rs- phase change liquid-gas st- gas only b) qr- liquid only rs- phase change liquid-solid st- solid only c) qr- solid only rs- phase change solid-liquid st- liquid only d) qr- phase change solid-liquid rs- liquid only st- phase change liquid-gas

gravity

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