Given,
m(Mass)=5kg,r(radius)=1mandv(velocity)=4ms−1
Let, θ(angle)madewithverticalaxis
Centripetal force, Fc=mv2r=5×421=80N
weight, W=mgcosθ=5×9.8cosθ=49cosθ
Tension in the string, T
T=Fr+W
31=80+49cosθ
cosθ=31−8049=−1
θ=cos(−1)=180o
Hence, body at the highest point.