Question

(a) the speed acquired. (b) the distance travelled.
8. (a) Define uniform acceleration. What is the acceleration of a body moving with uniform velocity?
(b) A particle moves over three quarters of a circle of radius r. What is the magnitude of its
displacement
9. A bus accelerates uniformly from 54 km/h to 72 km/h in 10 seconds Calculate
(i) acceleration in m/s2 (ii) distance covered by the bus in metres during this interval.
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- fort
hours. Calculate the average speed of the car.
u. 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
(c) time taken by the scooterist in reaching from A to B.
15. (a) Differentiate between uniform linear and uniform circular motion.
(b) Write any four examples of uniform circular motion.
(c) Is uniform circular motion accelerated motion?​

Answer 1

Answer: The 'acceleration of a body' moving with uniform velocity will be zero as acceleration is defined as the “rate of change of velocity” per unit time. So if the body exhibit uniform velocity, then the rate of 'change of velocity' (dv = 0) will be zero. ... Thus the acceleration of the body will also be zero.

Explanation: