local player = game.Players.LocalPlayer
local mouse = player:GetMouse()

mouse.KeyDown:Connect(function(key)
	if key == "e" then
		script.keypress:FireServer()
	end
end)

here is my local script; keypress is a remoteevent

script.Parent.keypress.OnServerEvent:Connect(function(plr)
	local human = plr.Parent:FindFirstChild("Humanoid")
	local torso = human.Parent:FindFirstChild("Torso")
	local vello = torso:FindFirstChild("cutvelocity")
	if human and torso and vello then
		vello:Delete()
	end
end)

here is the script fired by remote event (cutvelocity is a rename of a bodyvelocity instance)

by pressing e i want the velocity to delete, but nothing happens