One shoe has a pointed heel that has a small cross sectional area, and another shoe has a broad heel with a large cross sectional area. both shoes have the same mass and are made of the same material. which shoe can cause more pain if the same person wearing it accidently uses their heel to step on another person's foot? and why?

the shoe which having heel of smaller crossection area.

Explanation:

Pressure is defined as the thrust acting per unit area.

Thrust is the force which acts on the surface perpendicularly.

Pressure = force / Area

Its SI unit is Pascal or Newton per square metre.

As both the shoes have same mass, so force is same but the area of crossection is different for both the shoes.

Teh shoe having heel of small crossection area exerts more pressure on another person's feet then the shoe having heel which has more crossection area.

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

snell's law

refractve index = sin incidence / sin refraction