Question

1)A car travels with a velocity 10 m/s and accelerates at 5 m/s2.Calculate the final velocity when it has travelled 30 m.

2)A car starts from rest and attains a velocity of 18 km/hr in 2 s. Find its acceleration in Sl units.​

Answer 1

Hey mate here is your answer.

Initial velocity, u =10m/s

Acceleration, a = 5m/s^2

Distance, s = 30 m

Explanation:

1)By using III rd equation of motion:

v^2 - u^2 = 2as

v^2 -(10)^2 = 2*5*30

v^2 - 100 =300

v^2 =300+100

v^2=400

v=√400

v=20

Thus, the final velocity is 20m/s.

2)

Initial velocity, u = 0

Final velocity, v = 18 km

= (18*1000)/(60*60)

= 5m/s

Time taken, t = 2s

By using I st equation of motion:

v = u + at

5 = 0 + a*2

(5-0)/2= a

a = 2.5 m/s^2

Thus, the acceleration is 2.5 m/s^2.

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