A body starts moving with an initial velocity 50 m/s and acceleration 20 m/s

S = ut +at

= 200 + 160 = 360 m

Average speed during this interval,

= = 90 m/s

A body is moving with a speed of 20 m/s. When certain force is applied, an acceleration of 4 m/s

Using equation, v = u + at, we get

80 = 20 + 4 × t

or 4t = 80 – 20 = 60

or t = 15 s

Therefore, after 15 seconds, the velocity of the body will be 80 m/s.

A body starts from rest and moves with a constant acceleration. It travels a distance s

Distance travelled in first 10 seconds, is given by

s

To calculate the distance travelled in next 10s, we first calculate distance travelled in 20 s and then subtract distance travelled in first 10 s.

s = ut + at

Distance travelled in 10th second interval,

s

or s

Now,

or s

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