Question

22. A body starts from rest and moves along a straight
line path with uniform acceleration. The ratio of
velocities at t = 1s and t = 2 s is
(a) 2:1
(b) 1:2
(c) 1:2
(d) 2:1​
please fastttttttt

Answer 1

Answer:

b) 1:2

Explanation:

Answer 2

Answer:

(c) 1:2

Step-by-step explanation:

Given:

• A body starts from rest and moves along a straight line path with uniform acceleration.

To find:

• The ratio of velocities at t = 1 s and t = 2s.

Solution:

Using first equation of motion,

♦ v = u + at

Where,

v = Final velocity of the body.

u = Initial velocity of the body.

a = Acceleration of the body.

t = Time take by the body.

As the body is at rest initial velocity, u = 0 in both the cases.

v₁, when t = 1 s

• v₁ = 0 + a × 1
• v₁ = a × 1
• v₁ = a

v₂, when t = 2 s

• v₂ = 0 + a × 2
• v₂ = a × 2
• v₂ = 2a

Finally,

• The ratio of velocities = v₁/v₂
• The ratio of velocities = a/2a
• The ratio of velocities = 1:2

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