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select the correct scientific notation form of this numeral. 1,263
(1) 12.63 × 10 ^ 2
(2) 1.263 × 10 ^ 3
(3) 12.63 × 10 ^ 3
(4) 1.2 × 10 ^ 3

1.263 × 10^3

Explanation: in 1.263 × 10^3, move the decimal three places to the right.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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continuous conducting path for current, power supply