M - 67 4 17. a) Read the following table and answer the question
vechile total distance travelled total time
car 500 m
bike 400 m
auto 300 m
lorry 1500 m
1 . find the average speed of lorry?
2. which of the above vehicles average speed is more
3.what is insaraneous speed
4.find average speed of
auto
Answers
Answer:
We know that the given details are
Speed of the car =60
5
2
km/hr.
Total hours =6
4
1
hours
By using the formula, speed =distance/time
Distance of the car = speed of the car × time taken
=60
5
2
×6
4
1
=302/5×25/4
=7550/20
=755/2=377
2
1
∴ Distance covered =377
2
1
km.
Explanation:
1. The average speed of the lorry is 250km/hr
2. The vehicle whose average speed is more is the lorry.
3. The instantaneous speed is 63 km/hr.
4. The average speed of auto is 50 km/hr.
Given: vehicle's total distance travelled total time
car 500 m
bike 400 m
auto 300 m
lorry 1500 m
To Find: 1. find the average speed of the lorry?
2. which of the above vehicles' average speeds is more
3. what is the instantaneous speed
4. find the average speed of auto
Solution:
Speed of the car =60 km/hr
Total hours =6
By using the formula,
speed =distance/time
Distance of the car = speed of the car × time taken
=60 × 6 + 400 × 6 + 300 × 6+ 1500 × 6
=302/5×25/4
=7550/20
=755/2
= 377
Distance covered =377 km.
The average speed of lorry = 1500/6 = 250km/hr
instantaneous speed = 377/ 6 = 63 km/hr.
The average speed of auto = 300/6= 50 km/hr
Therefore, 1. The average speed of the lorry is 250km/hr
2. The vehicle whose average speed is more is the lorry.
3. The instantaneous speed is 63 km/hr.
4. The average speed of auto is 50 km/hr.
#SPJ2