Last seen: Nov 14, 2021
(a) Law of conservation of momentum (b) Newton’s second law of motion (c) Newton’s third law of motion (d) Newton’s first law of motion
Rocket engine provides a force to move the rocket upwards. figure.png
Mass of the gun m1 = 3 kg Mass of bullet m2 = 30 g = 0.03 kg Velocity of bullet v2 =100 m/s (i) According to the law of conservation of momen...
Mass of the body = 10 kg Initial velocity u = 4 m/s Final velocity v = 8 m/s Time t = 2 s (a) Momentum before force acts p1 = m x u = 1...
Mass of the body = 2.5 kg Initial velocity u = 20 m/s Final velocity v = 0 m/s Force F = 10 N Acceleration a = = = 4 m/s2 Since v < u, ...
Mass of the body = 20 kg Initial velocity u = 0 m/s Final velocity v = 100 m/s Force F = 100 N Acceleration a = = = 5 m/s2 Time t = ...
Mass of the car = 2400 kg Initial velocity u = 20 m/s Final velocity v = 0 m/s Time t = 10 s Retardation a = = = -2 m/s2 Force = m x a ...
Correct answer: (3) Reduction of ozone depleting substances
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Correct answer: (2) forests
Correct answer: (2) insecticide
Correct answer: (3) forest
Correct answer: (3) South Africa
Correct answer: (2) The Montreal Protocol
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Correct answer: (2) 2.5 or less