Numeicals Covered:
1. A car weighing 9800 N is moving with a speed of 40 Km/h. On the Application of breaks it comes to rest after traveling a distance of 50 meters. Calculate the average retarding force? (Ans: 1234. 57 N)
2. A helicopter weighs 3920 N. Calculate the force on it if it is ascending up at the rate of 2m/s2. What will be the force on helicopter if it is moving up with a constant speed of 4 m/s? (Ans: 4720 N, 3920 N)
3. A 100 grams bullet s fired from a 10 kg gun with a speed of 100m/s. What is the speed of recoil of the gun? (Ans: 10 m/s)
4. A machine gun fires 10 bullets per second into a target. Each bullet weighs 20 gram and had a speed of 1500 m/s. Find the necessary force to hold the gun in position? (Ans: 300 N)
5. A 50 grams bullet is fired into a 10 kg block that is suspended by a long cord so that it can swing as a pendulum. If the block is displaced so that its center of gravity rises by 10cm, what was the speed of bullet? (Ans: 281.4 m/s)
6. A 70-gram ball collides with another ball of mass 140 gram. The initial velocity of the first ball is 9m/s to right while the second ball is at rest. If the collision were perfectly elastic, what would be the velocity of two balls after the collision? (Ans: - 3m/s, 6 m/s)
7. A truck weighing 2500 kg and moving with a velocity of 21m/s collides with a stationary car weighing 1000 kg. The truck and car move together after the impact. Calculate their common velocity? (Ans: 15 m/s)
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