Question

The velocity of a car increases from 30 km per hr to 45 km per hr in 5min .Calculate acceleration and distance travelled​

Answer 1

ANSWER

Initial Velocity, u=54km/hr=15m/s

Final velocity , v=72km/hr=20m/s

Mass =1500kg

Initial kinetic energy

2

1

mu

2

⇒

2

1

1500×15×15=168750J

Final kinetic energy

2

1

mv

2

⇒

2

1

1500×20×20=300000J

So, change in kinetic energy = work done=300000−168750=131250J

Answer 2

Answer:

a=180 kmh^-2 and s=3.12 km

Step-by-step explanation:

• t=5min=1/12 hr

• v=u+at
• 45=30+a/12
• a=180 kmh^-2
• v^2-u^2=2as
• 2025-900=360s
• s=3.12km
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