Question

A horse starts from rest and speeds up with constant acceleration. If it has

gone a distance of 100 m at the point when it reaches a speed of 12 m/s,

what is its acceleration?

A. 8.3 m/s2

B. 1.4 m/s2

c. 2.1 m/s2

D. 0.72 m/s2

Answer 1

Answer:

OptionD

The acceleration of the horse is 0.72m/s2

Explanation:

We can use the formula

$v^2=u^2 +2as$

we are looking for the acceleration, which is a. To find this, we can make a the  subject of the formula as shown

$a = \frac{u^2 +v^2}{2s}$

Where a = acceleration of the horse

s = distance covered by the horse = 100m

v = final velocity of the horse = 12m/s

u = initial velocity of the horse = 0 m/s (this is because it starts from rest)

$a= \frac{0+12^2}{2 \times 100}=0.72m/s^2$

The acceleration of the horse is 0.72m/s2