Metric unit of energy is the joule or the erg :

1 joule = 10⁷ ergs

1 erg = kinetic energy of a mosquito in full flight!

1 gram of TNT (about a thimbleful) releases about 4 X 10¹⁰ ergs when it is detonated.  So a kilogram of TNT would release about 4 X 10¹³ ergs.

Let's work out the KE of a bicyclist going 20 km/h.
20 km/h = 20 X 10⁵ cm/sec / 3600 sec = 555 cm/sec.

Suppose the bicycle plus cyclist weigh 100 kg = 1 X 10⁵ g.

KE = mv² / 2 = 1 X 10⁵ X (555)² / 2 = 1.5 x 10¹⁰ ergs.  About equal to a thimbleful of TNT.

Now suppose the bicyclist is going much faster, say 100 km/h (by holding on to a car, say).  His velocity is 5 times more, so his KE is 25 times more.  So now his KE is 4 X 10¹¹ ergs.

Suppose we put him in low Earth orbit.  This requires 7 km/sec = 7 X 10⁵ cm/sec.
KE = mv² / 2 = 1 X 10⁵ X (7 X 10⁵)² / 2 = 2.45 x 10¹⁶ ergs.  We'd have to detonate 612 kg of TNT (0.6 of a ton) to release this much energy!