A coin and a peice of paper are dropped simultaneously from the same height. Which of the two will touch the ground first? What will happen if the coin and the peice of paper are dropped in vacuum? Give reasons for your answer.
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The speed-time graph of a car is given alongside. The car weighs 100 kg.
(i) What is the distance travelled by car in the first two seconds?
​(ii) What is the braking force applied at the end of 5 seconds to bring the car to a stop within one second?
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