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A force of 200N acting on a body of mass 20kg initially a...

A force of 200N acting on a body of mass 20kg initially at rest causes it to move a distance of 320m along a straight line for t secs. Find the value of t.

A.

4s

B.

6s

C.

8s

D.

10s

Correct answer is C

F = ma

200=20aa=10m/s2

s=ut+12at2

320=(0×t)+1210t2

320=5t2t2=64

t=8secs