Question

please answer the question

Answer 1

Answer:

A car acquires a speed of 54 km/h in 20 s after the start. The acceleration of the car is 0.75 m/s².

Step-by-step explanation:

• Initial velocity of car (u) = 0 m/s.

• Final velocity of car (v) = 54 km/h

$We \: need \: t o \: convert \: km/h \: into \: m/s.</p><p></p><p> \\ Final \: velocity = > 54 km/h</p><p></p><p> \\ = > 54 \times \frac{5}{18} </p><p></p><p> \\ = > 15 \: m/s$

$Time \: \: taken \: (t ) = \: 20 secs$

*We will use first equation of motion -

$= > v = u + at$

$⇒ 15 = 0 + a * 20$

$⇒ 20a = 15$

$⇒ a = \frac{15}{20}$

$⇒ a = \frac{3}{4}$

$⇒ a = 0.75 m/s²$

Hence, the acceleration of car is 0.75 m/s².

Answer 2

Answer is in the attachment