I need help with number 7 and 8

where's the following? you gotta add it to know what the choices are

explanation:

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

explanation:

considering the bohr theory, the type of connection that requires the transfer the answer conuldn't be right

a skateboard rolling across the street - apex