Question

1.A car starting from rest accelerates at a
rate of 8.0 m/s/s. What is its final speed at
the end of 4.0 seconds?

Answer 1

v =u + at
v = 0 + 8×4
= 32
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Answer 2

since
a= 8m/s^2
v=?
t = 4 sec

Now,
v=u+at
v=0+8×4
v=32m/s is final speed.