Answer:
5N
Step-by-step explanation:
Work done by a constant force is given by the following equation:
W=F⋅d⋅cos(θ)
where F is the applied force, d is the distance over which the force is applied, and θ is the angle between the force and displacement vectors.
In this case, the work is done by gravity, and as the object is assumed to fall straight down, θ=0^o.
We know that the force of gravity acting on an object can be expressed by FG=mg, and for an object which is not accelerating (e.g. a stationary object), this is equal to the object's weight.
We know d=10m,θ=0^o and W=50J, so we can solve for F to find the object's weight. ⇒F=Wdcos (θ) But cos (0^o)=1, so: F=Wd=50J10m=5N