1.A cyclist covers a distance of 15 miles in 2 hours. Calculate his speed.
2.A truck travels a distance of 12 m in 4 s.
Calculate the velocity of a
truck.
3.One car is initially at rest. In 12 s, a car accelerates to 24 m/s. What is the acceleration of a car?
2.A truck travels a distance of 12 m in 4 s.
Calculate the velocity of a
truck.
3.One car is initially at rest. In 12 s, a car accelerates to 24 m/s. What is the acceleration of a car?
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Answer:
1. we know that, speed=distance/time.
GIVEN
distance= 15miles = 24.1402km = 24.5km [approx.]
Time=2h
Speed=d/t
s=24.5/2=12.25km/hr
2. Well, 4m/s per second for 3 seconds, it gains 12m/s. The final speed is 24m/s.
Average speed is 18m/s for 3 seconds → 54metres distance. Or 54m West displacement.
Or, use s= ut + 1/2 a t^2
3. acceleration has to be zero