1+2=3 like me and Connor and my best friend

Abookcase has a mass of 38 kg and the coefficient of friction between it and the floor is 0.82 what is the maximum force of friction between the bookcase and the floor a 372n b 305n c 412n d 449n

What is the potential energy possessed by a rock of mass 4kg projected to a height of 2m (g=10m/s2)

The table shows columns that brenda uses for her notes on the properties of elements. her notes state that some elements can react to form basic compounds. where should brenda place this property in her table?