1) A car starts from rest with an acceleration of 6 m/sec2. After attaining a speed of 30 m/sec it maintains a constant speed. Find (a) the distance traveled in 10 seconds and (b) average speed during in the first 10 seconds.
initial velocity (u)= 0
acceleration = a = 6 m/s^2
final velocity due to acceleration = 30 m/s
v = u +a*t
=> t = (30-0)/6 = 5 s
Hence, after 5 sec the car will travel at constant speed of 30 m/s
distance travelled ...
With good explanations, the calculations solve the problems.