TOP 20 COMMON ERROR

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If the error in the measurement of momentum is 20 % , then the error in the calculation of kinetic energy is (assume the error in measurement of m as zero)

A : Out of the measurements A = 20.00 and B = 20.000, B is more accurate. R : Percentage error in B is less than the percentage error in A.

The angle of elevation of the top of a tower from the foot of a house, situated at a distance of 20 m from the tower is 60^(@) . From the top of the top of the house the angle of elevation of the top of the tower os 45^(@) . Find the height of house and tower.

When Rahul walks up a stationary escalator,then he takes 20s to reach the top.While when he walks up a moving escalator,he takes 10s to reach the top.The time taken by him to reach the top when stand still on the moving escalator is?

Find p, if 16 + p = 20 using trial and error method.