Physics
Grade-7
Easy
Question
What is the mass of the dark blue-colored car?
- 500 Kg
- 1000 Kg
- 1500 Kg
- 2000 Kg
Hint:
500 Kg
The correct answer is: 500 Kg
KE=1/2mv²
KE=200 KJ = 200×1000 = 200000 J;
v=100km/h = 100×(5/18)m/s = 27.7 m/s; of the dark blue car
m=(2KE)/v²
m=(2×200000)/27.7²
m= 400000/767.29
m= 521.31 kg
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