Question 212007PhysicsWAEC

A man of mass m, experiences a viscous drag, F and an upthrust, U as he descends towards the ground at a steady velocity, using a parachute. If the acceleration of free fall is g which of the following expressions is correct?

A

FU = mg

B

U + F - mg = 0

C

U - F = mg

D

F - U - mg = 0

Step-by-Step Explanation

When an object descends at a steady velocity, the net force acting on it is zero, indicating that all forces are balanced. In this scenario, the upward forces, which include the upthrust (U) and the viscous drag (F), must equal the downward force of gravity (mg). Therefore, the relationship can be expressed as U + F - mg = 0, confirming that the sum of the upward forces equals the weight of the object.

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