Clive H. answered 11/06/22
40 years teaching experience, graduate in Physics, MA in Education,
As there doesn't appear to be any friction, use f = ma
a = f/m = 480/25 = 19.2 m/s2. There is on horizontal force = 480 N. Downward force - weight = mg = 25 *9.8 = 245 N. The normal contact foce fn = 245 N upwards