Question

29
a) An object starting from rest travels 20 m in first 2 s. If it has uniform
acceleration, what is its velocity after 7 s from the start?
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Answer 1

Answer:

100m/s

Explanation:

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Answer 2

Answer:35m/s

Explanation:u=0(object start from rest)

Distance travelled, d=20m&time taken, t=2s

Now, final velocity, v=d/t

v=20/2

v=10m/s

So acceleration is, a=v-u/t

                    a=10-0/2

                      =10/2=5m/second sq•

Now we have, v=u+at

                           =0+(5) (7s)

                         v=35m/s