M=2450kg

V=72km/h

Ek=?

490,000J

Explanation:

Mass (M) = 2450kg

Velocity (V) = 72km/h

Converting from km/h to m/s:

(72km) * (1000m) * (1h) / (3600s) * (1km) (1h)

Km and h cancel out:

V = 20m/s

Kinetic energy (Ek) = ?

Ek=1/2MV^2

Ek=1/2 * (2450kg) * (20m/s) ^2

Ek=490,000J