Answer:
The equatiom of kinetic energy is 1/2×m×v² where m represents mass and v is velocity :
The unit for kinetic energy is measured in Joules (J).
The truck has more inertia, it is bigger/heavier so it would take a lot more force to get it to change its speed/direction
Answer:
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Speed = Distance/time
Speed = 800/40
Speed = 20 metre per second
The answer is a. 0.14 kg
PE = mgh
116.62 = m•(9.8)•(85)
m = 116.62/(9.8•85)
= 0.14 kg