Why is the weight of stone different in the air and water? explore.

Because it doesn't weigh the same in water as it does in air. It weighs less by a factor; the density of the liquid it displaces. That is what is called buoyancy.

The mass remains the same but that is not "weight" which includes a "force" component due to gravity and thus weight and mass are somewhat related but not exactly the same thing.

Explanation:

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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