Calculate the kinetic energy of a 925kg travelling at 90.0km/h?

[LadyG]

Calculate the kinetic energy of a 925kg travelling at 90.0km/h

please show me how to do it and not just the answer for future questions

[billrussell42]

Kinetic Energy in Joules
KE = ½mV²

plug in the numbers, first converting km/hr to m/s.

.

[Mark]

90km/h = 25 m/s

KE = 1/2 mv^2
= 1/2 x 925 x 25^2
= 289062.5 J
= 289 kJ

[parths]

Kinetic Energy = 1/2 mv² kg m² s²
Given mass = 925 kg
Velocity = 90 km/h = 90*1000/3600m/s
= 25m/s

So,
K.E. = 1/2 *925*25*25 = 289062.5 Joules