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7. MOTION
medium
A cheetah can accelerate from rest at the rate of $4 m s^{-2}$
$(i)$ What will be the velocity attained by it in $10\, s$ ?
$(ii)$ How far will it travel in this duration ?
Option A
Option B
Option C
Option D
Solution
Intial velocity, $u=0$
Acceleration, $a=4 m s ^{-2}$
$(i)$ From the first equation of motion,
$v=u+a t$
$=0+4 \times 10$
$=40 m s ^{-1}$
$(ii)$ From the second equation of motion,
$S=u t+\frac{1}{2} a t^{2}$
$=0 \times 10+\frac{1}{2} \times 4 \times(10)^{2}$
$=200 m$
Standard 9
Science
