# Difine accelerration and give its SI unit. when is acceleration of a body negative? Give two example of situation in which acceleration of the body is negative

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Hey mate!

Here's your answer!!

Acceleration of a body is defined as the rate of change of its velocity with time.

The SI unit of acceleration is m/s².

If the object is slowing down then its acceleration is directed in the opposite direction as its motion in this case, a negative acceleration.

Some common examples are :

A car is moving with high velocity (say v1 = 100km/hr toward North) suddenly it's driver notices a dog crossing the road, applies the brake and reduces the velocity of car to zero(v2 = 0) in 10 seconds (t2 - t1 = 10). So v2 -v1 is negative, implies negative acceleration.

A ball thrown up in sky with high velocity(say v1 = 10m/s), reach certain height, then stats falling back and reaches the starting point again with same speed but in opposite direction, (so velocity v2 = -10m/s). Here also v2 - v1 is negative, so negative acceleration.

Here's your answer!!

Acceleration of a body is defined as the rate of change of its velocity with time.

The SI unit of acceleration is m/s².

If the object is slowing down then its acceleration is directed in the opposite direction as its motion in this case, a negative acceleration.

Some common examples are :

A car is moving with high velocity (say v1 = 100km/hr toward North) suddenly it's driver notices a dog crossing the road, applies the brake and reduces the velocity of car to zero(v2 = 0) in 10 seconds (t2 - t1 = 10). So v2 -v1 is negative, implies negative acceleration.

A ball thrown up in sky with high velocity(say v1 = 10m/s), reach certain height, then stats falling back and reaches the starting point again with same speed but in opposite direction, (so velocity v2 = -10m/s). Here also v2 - v1 is negative, so negative acceleration.

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