A body moving along a straight line at 20 m/s undergoes an acceleration of -4 m/s2. What will be its speed after two seconds?
sreyasanshaji:
Pls answer
speed = distance/ time
right?
ummm.. yeah
but beacuse it's a case of acceleration so you cannot apply that rule
because*
oh right! thanks
Answers
Answered by
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Initial velocity (u) = 20m/s
Acceleration (a ) = -4m/s^2
time taken (t) = 2s.
Using defination of acceleration AKA 1st law of motion i.e
v = at + u
v =( -4 ×2) + 20
= -8 +20
= 12.
Therefore underthese circumstances, the sped of the body will be 12m/s
Acceleration (a ) = -4m/s^2
time taken (t) = 2s.
Using defination of acceleration AKA 1st law of motion i.e
v = at + u
v =( -4 ×2) + 20
= -8 +20
= 12.
Therefore underthese circumstances, the sped of the body will be 12m/s
Thank you
you're welcome sweetheart ^_^
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