Question

6. If the particle have negative velocity and
negative acceleration its speed​

Answer 1

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If a particle has negative velocity and negative acceleration then particle moves just opposite direction of its motion. Means, speed of particle increases with increasing time in opposite direction.

Let's take an example to understand.

Let initial velocity , u = -3 m/s and acceleration , a = -5 m/s², what is the velocity at time t = 3 and also find speed of it at t = 3 ?

initial velocity = - 3m/s

so, initial speed = |initial velocity| = 3m/s

Acceleration , a = -5 m/s²

Use formula, v = u + at

v = -3 + (-5) × 3 = -3 - 15 = - 18 m/s²

Hence, final velocity = - 18m/s²

And final speed = | final velocity | = 18 m/s

What you observed ?, yeah, speed of particle increases.

Answer 2

Answer:

If a particle has negative velocity and negative acceleration then particle moves just opposite direction of its motion. Means, speed of particle increases with increasing time in opposite direction.

Let's take an example to understand.

Let initial velocity , u = -3 m/s and acceleration , a = -5 m/s², what is the velocity at time t = 3 and also find speed of it at t = 3 ?

initial velocity = - 3m/s

so, initial speed = |initial velocity| = 3m/s

Acceleration , a = -5 m/s²

Use formula, v = u + at

v = -3 + (-5) × 3 = -3 - 15 = - 18 m/s²

Hence, final velocity = - 18m/s²

And final speed = | final velocity | = 18 m/s

What you observed ?, yeah, speed of particle increases.