3rd Equation of Motion
Trending Questions
A charged body is kept in an electric field where it experiences a constant acceleration of 10 m/s2 in the positive x-direction. The body hits wall after travelling 4 m and rebounds but can travel only upto 2 m before coming to rest momentarily . If the body was in contact with the wall for 12 ms then find the average acceleration of it due to the impact?
(AIEEE 2003)
- 12 m
- 18 m
- 24 m
- 6 m
- 1.5 cm
- 3.0 cm
- 2.0 cm
- 1.0 cm
A bullet moving with a velocity of 200 cm/s penetrates a wooden block and comes to rest after traversing 4 cm inside it. What velocity is needed for travelling distance of 9 cm in same block?
136.2 cm/s
300 cm/s
100 cm/s
250 cm/s
- Zero
- 8 m/s2
- – 8 m/s2
- 4 m/s2
A train is travelling at the speed of 180 km/hr. In order to trap superman Lex Luthor has broken the tracks. Unware of Luthor's evil intensions, superman tries to stop the train by pushing it in opposite direction.Right at the moment when the train is 300 m away from the crack in the track, Superman is applying a deceleration of 5 m/s2. Just after 2 sec a bullet laced with kryptonite hits superman which incapacitates him for a while. How long has super man got to remove the bullet and start to give deceleration so to protect the innocents? (Trains brake system has failed)
2s
1.25s
0s
1s
- 2
- 3
- 4
- 5