In physics lab, you measure three quantities: x , y , and z . suppose that x = 1.1 cm , y = 0.8 s , and z = 3.9 cm/s . which of the mathematical combinations might be meaningful?

a)

b)

e)

h)

Explanation:

The given options are:

a)

b)

c)

d)

e)

f)

g)

h)

Let's try with each of them and find the mathematical combinations that might be meaningful, taking into account ,  and . This means we have to be careful with the units:

a)

Here we have a mulitplication:

Could be meaningful

b)

Could be meaningful

c)

Not meaningful, since we cannot operate summing and subtracting with two different units.

d)

Not meaningful, since we cannot operate summing and subtracting with two different units.

e)

Could be meaningful

f)

Not meaningful, since we cannot operate summing and subtracting with different units.

g)

Not meaningful, since we cannot operate summing and subtracting with different units.

h)

Could be meaningful

real, smaller and upside-down.   so the answer should be b.