How to prove that the value of g is 9.8m/s²

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Q. The actual value of the acceleration of gravity is

9.8 m / s

. Physics students in a laboratory experiment use a pendulum to determine the acceleration of gravity. Their experimental value is

9.2 m / s

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What is their percent error?

A balloon is ascending at the rate of 9.8m/s. At height of 39.2m above the ground. When a foot packet is dropped from balloon. After how much time and with what velocity does it reach the ground. ( $g = 9.8 m / s^{2}$ )

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A stone is thrown vertically upwards with a speed of 20 m/s. How high will it go before it begins to fall? $(g = 9.8 m / s^{2})$

Q. A particle of mass 0.5 gm and charge

2.5 \times 10^{- 8} C

is moving with velocity

6 \times 10^{4} m / s

. What should be the minimum value of magnetic field acting on it, so that the particle is able to move in a straight line ?

(g = 9.8 m / s e c^{2})

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