Question

8. A body moving with uniform acceleration describes 20m in 2nd second and 30m in 4th second of its motion.
Calculate the distance moved by it 6th second.
9. A bus starts from rest and accelerates uniformly for 20s to a velocity of 18km/hr. It then runs at a constant
velocity and is brought to rest in 100m with a constant retardation. If the total distance travelled is 0.5km,
calculate (i) acceleration, (ii) retardation and (iii) total time taken.
10. Prove v-u? =2as
11. Two forces whose magnitudes are in the ratio 3:5 give a resultant 35N. If the angle of inclination is 60° find
magnitude of each force.
12. A swimmer can swim with velocity of 10km/hr with respect o the water flowing in a river with velocity of
5km/h. (i) in what direction should he swim to reach the point on the other bank just opposite to his starting
point? (i) What is the time taken by him to cross the river if it is 100m wide?
13. Prove that X = 2î + 3ỉ + k and B = -5 + 2j - k are collinear vectors.
14. A mass of 5kg is acted upon by a force of 1N. Starting from rest, how much is distance covered by the mass in
10s?
magnitude and direction of
15. A plane of mass 500kg rises with a vertical acceleration of 10m/s . The weight of the pilot is 60kg. Give the
(a)Force on the floor by the pilot
(b)Force on the helicopter due to the surrounding air (g=10m/s)
16. A bullet of mass 20g is fired by a gun of mass 20kg. If the muzzle speed of the bullet is 100m/s, what is the
recoil speed of the gun?
17. A ball of mass 100g moving with a velocity of 10m/s is brought to rest by a boy in 0.02sec. Calculate () the
impulse of the hall in the forma​

Answer 1

question is an improper way and can't understand