Question

a bus decreases its speed from 80km h-1 to 60km h-1 in 5 seconds.find the acceleration of the bus.​

Answer 1

Answer:4

Explanation:80-60÷5

=20÷5

=4

Answer 2

$\huge\underline\purple{\sf ♡Answer:-}$

$\large{♡}$$\large{\boxed{\sf Acceleration (a)=1.1m/{s}^{2}}}$

$\huge\underline\purple{\sf ♡Solution:-}$

Given :-

Initial velocity (u)= 80 km/h

Final Velocity (v) = 60km/h

Time (t) = 5 second

To find :-

Acceleration of bus(a) = ?

━━━━━━━━━━━━━━━━━━━━━━━━━━

We know that :-

$\large{♡}$$\large{\boxed{\sf a ={\frac{v-u}{t}}}}$

but given Velocity is in km/hr convert it into m/s

$\large{\sf 80 km/h}$

$\large\implies{\sf 80×{\frac{1000}{3600}}}$

$\large\implies{\sf 16.6m/s}$

$\large{\sf 60m/s }$

$\large\implies{\sf 60×{\frac{1000}{3600}}}$

$\large\implies{\sf 22.2m/s}$

━━━━━━━━━━━━━━━━━━━━━━━━━

ON PUTTING VALUE IN FORMULA :-

$\large\implies{\sf {\frac{16.6-22.2}{5}}}$

$\large\implies{\sf {\frac{-5.6}{5}}}$

$\large\implies{\sf -1.1m/{s}^{2}}$

Here negative sign indicates Decelaration

$\huge\red{♡}$$\large\red{\boxed{\sf a =-1.1m/{s}^{2}}}$