Question

The acceleration of a car that speeds up from 12 meters per second to 30 meters per second in 15 seconds- (a) 2.4 m/s2 (b) 1.2 m/s2 (c) 2m/s2 (d) 5.2 m/s2

Answer 1

Answer:

B) 1.2 m/s^2

Explanation:

u = 12m/s

v = 30m/s

T = 15s

a = ?

now,

v = u +at

30 = 12 + a×15

18 = 15a

a = 1.2 m/s^2

Answer 2

the acceleration of a car with speeds up from 12 metre per second to 30 metre per second in 15 second is equal to 1.2 metre per second square

option B

Explanation:

• The rate of change of linear velocity is defined as the acceleration

Given,

initial velocity of a car is 12 metre per second.

The final velocity of a car is 30 metre per second.

The change in velocity is equal to  30-12= 18m/ sec

The time taken for the change is equal to  15 second

The rate of change of velocity is equal to 18/15 = 1.2 m/sec²

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