अनियमित रेल्वेच्या वेळापत्रकाविषयी तक्रार करणारे पत्र रेल्वे अधिकाऱ्यास लिहा .
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The change in velocity in unit time is called acceleration.
Acceleration is a vector.
The direction of acceleration will be in the direction of change in velocity.
Its SI unit is metre / second ² abbreviated as m/s²
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