Question

A body moving in a straight line 72kmph undergoes in a acceleration of 4m/s2. find its speed after 2 seconds

Answer 1

Here u=20 m/s
a=4 m/s²
t=2 s
∴By Newton's 1st equation of motion,i.e,
v=u+at
∴v=20+4×2
∴v=28 m/s

Answer 2

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