Answered

IDNLearn.com connects you with experts who provide accurate and reliable answers. Discover in-depth answers to your questions from our community of experienced professionals.

A bus slams on its breaks and goes from 30 km/hr to 15km/hr in 4 seconds. What is its acceleration?

Sagot :

Luanaidn
[tex]Formula\ for\ acceleration:\\\\ a=\frac{v_2-v_1}{t}\\\\ v_1=30km\hr\\v_2=15km\hr\\t=4s\\\\ a=\frac{15-30}{4}=\frac{-15}{4}=-3,75\frac{km}{s^2}\\\\Acceleration\ is\ equal\ to\ 3,75{km}{s^2}. \\Bus\ is\ deccelerating.[/tex]

Acceleration is the rate of change of speed.

If the speed is increased then its called acceleration

If the speed is decresed then its a negative acceleration also called deceleration

the formula for calculating acceleration is

[tex] a = \frac{v-u}{t} [/tex]

where a - acceleration

v - final velocity

u - initial velocity

t - time

v - 15 km/hr should be converted to m/s

distance in 1 hour - 15 km

1 hour = 3600 s

1 km - 1000 m

in 3600 s - 15 000 m

in 1 s - 15 000 m / 3600 s = 4.17 m/s


u - 30 km/hr

in 3600 s - 30 000 m

in 1 s - 30 000 m / 3600 s = 8.33 m/s



substituting the values in the equation

[tex] a = \frac{4.17 m/s - 8.33 m/s}{4 s} = \frac{-4.16}{4} [/tex] = -1.04 m/s²

the answer is negative means its deceleration

the acceleration is -1.04 m/s²

We appreciate every question and answer you provide. Keep engaging and finding the best solutions. This community is the perfect place to learn and grow together. Thank you for trusting IDNLearn.com with your questions. Visit us again for clear, concise, and accurate answers.