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Derive the formula s= `ut+1/2at^2` , where the symbols have usual meanings.
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A train starting from stationary position and moving with uniform acceleration attains a speed of 36 km per hour in 10 minutes. Find its acceleration.
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A car acquire a velocity of 72 km per hour in 10 second starting from rest. Find
(1) the acceleration,
(2) the average velocity, and
(3) the distance travelled in this time.
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A car is travelling along the road at 8 ms-1. It accelerates at 1 ms-2 for a distance of 18 m. How fast is it then travelling ?
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To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.
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A boy is sitting on a merry-go-round which is moving with a constant speed of 10 m s−1. This means that the boy is :
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A freely falling object travels 4.9 m in 1st second, 14.7 m in 2 nd second, 24.5 m in 3rd second, and so on. This data shows that the motion of a freely falling object is a case of :
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When a car driver travelling at a speed of 10 m/s applies brakes and brings the car to rest in 20 s, then retardation will be :
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Which of the following could not be a unit of acceleration?
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A bus increases its speed from 36 km/h to 72 km/h in 10 seconds. Its acceleration is :
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The slope of a speed-time graph gives:
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Two bodies A and B of equal masses are kept at heights of h and 2h respectively. What will be the ratio of their potential energies?
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Is potential energy a vector or a scalar quantity?
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State whether the following statement is true or false :
The potential energy of a body of mass 1 kg kept at a height of 1 m is 1 J.
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What happens to the potential energy of a body when its height is doubled?
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A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
potential energy acquired by the weights.
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A weightlifter is lifting weights of mass 200 kg up to a height of 2 metres. If g = 9.8 m s−2, calculate :
work done by the weightlifter
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A boy weighing 50 kg climbs up a vertical height of 100 m. Calculate the amount of work done by him. How much potential energy does he gain? (g = 9.8 m/s2)
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To what height should a box of mass 150 kg be lifted, so that its potential energy may become 7350 joules? (g = 9.8 m/s2)
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On what factors does the gravitational potential energy of a body depend?
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