Question

D. 17.6% -1 -2 Q3. The velocity of a car increases from 36 kmh to 108 kmh in 10 seconds. A. 2 ms2 B. 3 ms C. 20 ms D. 30 ms -2 -2 -2​

Answer 1

Answer:

A. 2m/s^2

Explanation:

1km/hr=5/18mper sec.

therefore,

108km/hr= 108×5/18=30m/s

similarly, 36km/hr=10m/sec.

acceleration is change in velocity per unit time.

a=∆v/∆t

a=(30-10)/10sec.

=20/10

=2m/sec^2.

Answer 2

Answer:

$v = u + at. \\ 30 = 10 \times a \times 10. \\ 30 - 10 = 10a. \\ 10a = 20. \\ a = \frac{20}{10} \\ a = 2m \: per \: sec {}^{2} .$