The Flash's punch rate is 1 Billion Punches per second. That is one billion infinite mass punches.

Does The Flash have super strength?

The Flash does not have super-strength - his only power is his super-speed, and the many (MANY) implementations that ability has. He's been able to use his speed in ways that could be said to approximate super-strength.

How strong is Flash's body?

4 SUPER STRENGTH

For one thing, The Flash can lift extremely heavy objects as long as he's moving fast enough, since he can move them before the force of gravity takes effect on the object's weight. Or, if he's moving fast enough, he can simply push a heavy object with the force of his inertia.