Question

A body is moving along a straight line at 20m/s undergoes an acceleration of 4m/s. After 2 second, its speed will be ​

Answer 1

Answer:

V-U/T =A

V-20=4*2

V= 28 m/s

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Answer 2

How to actually solve these types of questions???

Just read it line by line and find its meaning. Then solve it. Too simple.

First of all, the body is moving in a straight line. So, its motion is a straight-line motion.

When Speed = 20 m/s,

Acceleration = 4 m/s.

After 2 seconds, it speed will be = ?

Let after "2" seconds its speed will be x m/s.

Overall Change in speed = (x-20) m/s.

Time (t) is given 2 seconds.

Acceleration will remain constant, as per given question.

So, now, by using formula,

Acceleration = $\frac{change \: in \: speed}{time \: taken}$

Or, $\: 4 = \frac{x - 20}{2}$

Or, 8 = x - 20

Or, x = 28

So, after two seconds its speed will be 28 m/s.