science
Grade-9
Easy
Question
A car starts from rest and keeps increasing its speed by 3 m/s every second. The final speed that it reaches after 20 seconds is _____.
Hint:
60 m/s
The correct answer is: 60
Given that,
The initial velocity, u = 0
The acceleration, a = 3 m/s2
Time taken, t = 20 s
On using the first equation of motion we get,
v = u + at
Or, v = 0 + 3 x 20
Or, v = 60 m/s
Therefore, the final velocity of the car is 60 m/s.
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