Question

0.10. A car increases its speed from 20 km/h to 30 km/h in 10 seconds. Its acceleration is (a).30 m/s (b) 7 m/s (c) 18 m/s (d) 0.83 m/s​

Answer 1

Answer:

acceleration is 0.278 m/sq.s

not in given options

Explanation:

Given,

u = 20km/h = 20× (5/18) m/s

u = 5.55 m/s

v=30km/h = 30× (5/18) m/s

v= 8.33 m/s

t=10s

using equation,

v=u + at

8.33=5.55 + a10

a= (8.33-5.55)/10

a=. 278 m/s2

Answer 2

QUESTION:-

A car increases its speed from 20 km/h to 30 km/h in 10 seconds. Its acceleration is

(a).30 m/s (b) 7 m/s (c) 18 m/s (d) 0.83 m/s​

EXPLANATION :-

We know that:-

a=(v-u)/t

where

a=acceleration

v=final velocity

u=initial velocity

t=time

In this question:-

v=30 km/hr=30×5/18=8.33 m/s

u=20 km/hr=30×5/18=5.55 m/s

t=10 s

So,

a=(8.33-5.55)/10

a=0.278 m/s²

So the acceleration is 0.278 m/s²

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