Question

10. A car moves with a speed of 30 km/h- for half an hour, 25 km/h-' for one
hour and 40 km/h' for two hours. Calculate the average speed of the car.
11. Derive the equation for velocity-time relation (v=u + at) by graphical method.
12. A car is travelling at 20 km/h, it speeds upto 60 km/h in 6 seconds. What is its
acceleration?
13. A car accelerates from 6 ms 16 ms in 10 sec. Calculate
(a) the acceleration and
(b) the distance covered by the car in that time.
14. A circular track has a circumference of 3140 m with AB as one of its diameter.
A scooterist moves from A to B alone the circular path with a uniform speed of 10
m/s. Find
(a) distance covered by the scooterist,
(b) displacement of the scooterist, and
I time taken by the scooterist in reaching from A to B.
15. (a) Differentiate between uniform linear and uniform circular motion.
() Write any four examples of uniform circular motion.
I Is uniform circular motion accelerated motion?
16. (a) Differentiate between speed and velocity.
(b) When is a body said to have uniform velocity?
I How can we describe the position of an object?
Illustrate with suitable example.
17. The graph given alongside shows how the speed of a car changes with time.
(i) What is the initial speed of the car?
(ii) What is the maximum speed attained by the car?
(iii) Which part of the graph shows zero acceleration?
(iv) Which part of the graph shows varying retardation?
(v) Find the distance travelled in first 8 hours.
40
30
20
Speed
10 + A
D
8
10
0
2
Time in hour)
18. Study the velocity-time graph and calculate.​

Answer 1

Answer:

Derive the equation for velocity -time relation (v=u+at) by graphical method.