Diploducs tail whip force.

Don't know, but to a human... Well, that's one less human.

Not sure what the force would be, but I'd imagine the person's family would have the remains cremated. 

So he would die?

It's suspected Diplodocids could whip their tails at supersonic levels, so yes...that human would be no more after the tree eater got done with him/her

You wouldn't even need a body bag. Just a mop.

and a bucket!

A mop and bucket might be a bit much. Maybe just a sponge or one of those swiffer things.

Come on guys I'm tutting to eat.

Might want a sponge for that too then. Or a mop and bucket. 

There's always the flamethrower route as well...

So it would hurt?

No, you'd be human pulp before you even realized what happened.

how would it kill a human?

Well, when you take an object roughly the size of a small tree travelling at potentially super-sonic speeds and hit a human with it... Imagine a 120mm artillery shell hitting someone 10 meters away.

So a bat hiting a grape basically.

Basically.

Eww

You would have a human slushy due to it's force.

Yum.

Most likely.