Question

Calculate the speed of an 8.4 × 10
4
kg airliner
with a kinetic energy of 1.4 × 10
9
J.
Answer in units of m/s

Answer 1

1 J= 1 (kg-m^2)/s^2
1.4 × 10 J = 1.4 × 10^9 (kg-m^2)/s^2

KE = (1/2).m.v^2

Substitute m=8.4 × 10^4 kg
and KE = 1.4 × 10^9 (kg-m^2)/s^2