The speed of a 1000-kg car whose KE is 450 kJ is
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KE= 1/2mv^2
(1/2)(1000kg)(17m/s)^2 =144.5kJ, where kJ is 1000 Joules, or 1000 kg*m^2/s^2
(1/2)(1000kg)(17m/s)^2 =144.5kJ, where kJ is 1000 Joules, or 1000 kg*m^2/s^2
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Given - Mass and kinetic energy
Find - Speed
Solution - The velocity or speed of the car is 30 metres/second
The kinetic energy is given by the formula = 1/2*mass*velocity².
Keep the values in the formula to find the velocity.
450*1000 = 1/2*1000*velocity²
Cancelling 1000 as it is present on both sides of equation.
Velocity = ✓450*2
Performing multiplication to find velocity.
Velocity = ✓900
Finding the square root to find the velocity.
Velocity = 30 metre/second
Thus, the velocity or speed of the car is 30 metres/second
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