A difference between mechanical and electromagnetic waves is a. Only mechanical waves can measure frequency

b. Only electromagnetic
waves travel through gas particles

c. Only electromagnetic waves travel
through space

d. Only mechanical waves include light

c. Only electromagnetic waves travel  through space

Explanation:

Electromagnetic waves are the only waves that travels through space or vacuum.

These waves do not require any material medium for their propagation as the case may be.

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2