A brick of mass 2 kg falls through water with an acceleration of 2 ms-2. The total force of the resistance is ___N ?

1 Answer
Junaid Mirza
Apr 17, 2018

#"15.6 N"#

Explanation:

Net acceleration is given by

#"a" = "F"_"net"/"m" = ("F"_g - "F")/"m"#

(Where #"F"_g# and #"F"# are gravitational force and resistance force respectively)

#"a" = ("mg - F")/"m"#

#"2 m/s"^2 = (("2 kg × 9.8 m/s"^2) - "F")/"2 kg"#

#"F" = (19.6 - 4)\ "N = 15.6 N"#

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