A Block of Metal Weighs 40 N in Air $1000 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

Multiple Choice

A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force on the block due to the water? The density of water is $1000 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

A) 30 N
B) 40 N
C) 10 N
D) 70 N