Question 3.1. An object travels 60 m in first 6 s.Then keeps uniform motion for next 9 s. In the last 10 s of the journey it decelerates uniformly to rest. Find the (a) Maximum speed attained in the journey. (b) Total distance traveled in the whole journey.

Question 3.2. An object is traveling with a constant acceleration of 10 m/s^-2. How much distance will it travel in 3rd second of its journey?

Question 3.3. A helicopter is ascending vertically at a speed of 19.6 m/s. When it is at a height of 156.8 m above the ground, a stone is dropped. How long does the stone take to reach the ground?

Question 3.4. Using the following data, draw a velocity-time graph for a short journey on a straight level road of a motorbike. Velocity(m/s) 0 10 20 20 20 20 0 Time(s) 0 30 60 90 120 150 180 Use the graph to calculate a) The initial acceleration b) The final acceleration c) The total distance …

Question 3.5. A proton moving with a speed of 1.0×10^7 m/s passes through a 0.020 cm thick sheet of paper and emerges with a speed of 2.0×10^6 m/s. Assuming uniform deceleration, find retardation and time taken to pass through the paper.

Question 3.6. A constant force F, changes the speed of a 80 kg sprinter from 3m/s to 4 m/s in 0.5 s. Calculate the acceleration of the sprinter.

Question 3.7. A 4 kg ball traveling with the speed of 2m/s strikes a rigid wall and rebounds elastically. If the ball is in contact with the wall for 0.050 s, what is (a) the momentum imparted to the wall and (b) the average force exerted on the wall?

Question 3.8.A projectile is thrown with a speed of 100 m/s at 30 with the horizontal. Find, (a) Time of flight (b) Maximum height it raised (c) The range traveled?

Question 3.9. The maximum height gained by a projectile is 300 m. If it travels a range of 800 m, find the displacement of summit point from the point of projection.

Question 3.10. Calculate the angle of projection for which k.E. at the highest point of its trajectory is equal to one-fourth of its k.E at point of projection.