Can someone explain college physics

6.56×10⁻²⁵ m/s²

Explanation:

The force the Earth exerts on the apple is equal to the mass of the apple times its acceleration (Newton's second law).

F = ma

F = (0.4 kg) (9.8 m/s²)

F = 3.92 N

The apple exerts an equal and opposite force on the Earth.

F = ma

3.92 N = (5.98×10²⁴ kg) a

a = 6.56×10⁻²⁵ m/s²

The Earth accelerates towards the apple at 6.56×10⁻²⁵ m/s².

Round as needed.