If a particle has negative velocity and negative acceleration, its speed
(a) increases
(b) decreases
(c) remains same
(d) zero
Answers
Answered by
50
Answer :- option (a)
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.
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.
Answered by
9
Explanation:
Your answer is (a) increases
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