A race track is in the shape of a rectangle with length of 75 metres and area of 3000 m2. A car takes 20 seconds to make one lap around the perimeter of this track. If the car and a person whose speed is 5 m/s, started moving at the same time along the perimeter of the track but in opposite directions, then find the distance between the car and the person, 3 seconds before they cross each other.
Area of the track = length of track x breadth of track = 75 x breadth of track = 3000 So, breadth of track = 3000 ÷ 75 = 40 So, perimeter of the track = (75 + 40) x 2 = 230 metres So, speed of the car = (230/20) = 11.5 m/s Relative speed of the car with respect to the person = 11.5 + 5 = 16.5 m/s So, distance between the car and the person, 3 seconds before they cross each other = 16.5 x 3 = 49.5 metres
The _________ property of the element is a whole number.
Which of the following is the most reactive element in the Periodic table?
Which substance is commonly used as a thermometric material in thermometers due to its expansive properties under temperature changes?
What is the primary purpose of using bleaching powder in drinking water?
Litmus paper, used to test pH levels, is derived from which organism?
What is the primary use of calcium carbonate in antacid tablets?
Formula of ‘Quick Lime’ is __________
What are antibiotics?
What term describes the enthalpy change when a substance transitions from solid to liquid at its melting point?
Which gas is most abundant in the Earth's atmosphere.
