The radius of the wheel of a vehicle is 35 cm. The wheel makes 10 revolutions in 6 seconds. The speed of the vehicle is:
Answer & explanation
Correct answer: option 2
radius of the wheel of a vehicle = 35 cm
Distance in 1 revolution = 2Πr = 70Π cm
Distance in 10 revolutions = 700Π cm = 7Π m
The wheel makes 10 revolutions in 6 seconds
Speed = 7Π/6 = 11/3 m/sec = 11/3 * 36/10 = 66/5
The correct answer is Option (2) → 13.2 km/hr