Question

a body move in a straight line with uniform acceleration of 2 m/s the initial velocity of the body is 10 m/s find the velocity of the body after covering 75m the time taken by the body to attain this velocity ​

Answer 1

Answer:

Given,

u=10m/s

a=2m/s

2

t=4sec

Acceleration, a=

t

v−u

2=

4

v−10

v=10+8=18m/s

The correct option is D.

Step-by-step explanation:

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Answer 2

★ Given -:

acceleration of the body = 2m/s²

initial velocity = 10 m/s

★ To find -:

→ The velocity of body after covering 75 m

→ Time taken to attain that velocity .

★ Solution -:

We know that ,

v² = u² + 2as

v = u + at

___________________________________

u = 10 m/s , a = 2m/s² , s = 75 m

by putting the values

v² = u² + 2as

v² = (10)² + 2(2 × 75)

v² = 100 + 300

v² = 400

v = √400

v = 20 m/s

$\purple{\therefore \: velocity\: of \: body\: after \: covering \: 75 \: m \: = \: 20 \: m/s }$

_____________________________________

v = 20 m/s , u = 10 m/s , a = 2 m/s² , t = ?

by putting the values

v = u + at

20 = 10 + 2t

20 - 10 = 2t

10 = 2t

t = 10/2

t = 5s

$\purple{\therefore \: time\: taken \: = \: 5 \: s}$