CBSE ADDA Numericals On Motion
Q.1: An athlete completes one round of circular track of diameter 200 m in 40 sec. What will be the distance covered and the displacement at the end of 2 minutes 20 sec?
( 2200 m , 200 m)
Q.2: Joseph jogs from one end A to another end B of a straight 300 m road in 2 minutes and 30 sec and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B (b) from A to C?
(2 ms‑1, 1.90 ms-1 , 0.952ms-1 )
Q.3. Abdul while driving to school computes the average speed for his trip to be 20 kmh-1. On his return trip along the same route, there is less traffic and the average speed is 30 kmh-1. What is the average speed of Abul’s trip? (24 kmh-1 )
Q.4: A motor boat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms-2 for 8.0 s. How far does the boat travel during this time? (96 m.)
Q.5: A driver of a car travelling at 52 kmh-1 applies the brakes and accelerates uniformly in the opposite direction. The car stops after 5 s. Another driver going at 34 kmh-1 in another car applies his brakes slowly and stops in 10 s. On the same graph paper, plot the speed versus time graphs for two cars. Which of the two cars travelled farther after the brakes were applied?
(ans. 36.1 m, 47.2 m, the second car travels farther than the first car after they applied the brakes)
Q.7: A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10ms-2, with what velocity will it strike the ground? After what time will it strike the ground
(20 ms-1. 2 s.)
Q.10: An artificial is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hrs to revolve around the earth (3.07 km/s)
Q. 12. A bus decreases its speed from 80 km/h to 60km/h in 5 s. Find the acceleration of the bus.
( -1.11 ms-2)
Q.13. A train starting from the railway station and moving with a uniform acceleration attains a speed of 40 km/h in 10 minutes. Find its acceleration. (1/54 ms-2 )
14. A stone is dropped from the top of a building of height 45 m. Calculate its velocity, when it strikes the ground . (Take g=10 m/s2)
Comments
Post a Comment