Question

An astronaut throws a wrench in interstellar space. How much force is required to keep the wrench moving continuously with constant velocity?

Answer 1

the answer is a force is equal to zero

Answer 2

Answer: The force required to keep the wrench moving continuously in space is 0 N.

Explanation:

Force applied on an object is defined as the product of the mass and acceleration of the object.

Mathematically,

$F=ma$

where, F = force applied

m = mass of the wrench

a = acceleration of the wrench

Acceleration is defined as the rate of change of velocity with respect to time. We are given, a wrench is moving with a constant velocity, so the acceleration of the wrench will be 0.

$a=\frac{dv}{dt}=0$    (At constant velocity)

Putting values in above equation, we get:

$F=m\times 0=0$

Hence, the force required to keep the wrench moving continuously in space is 0 N.