Question

10. If a particle has negative velocity and negative acceleration, its speed

(a) increases (b) decreases (c) remains same (d) zero







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Answer 1

Answer:

Answer :- option (a)

Explanation: 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, intial speed = |intial 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.