Class : 9th Chapter Motion ke two any numerical problems with answer dena please
Answers
Answer:
1. From a rifle of mass 4 kg, a bullet of mass 50 g is fired with an initial velocity of 35 m/s. Calculate the initial recoil velocity of the rifle.
Ans. (m1) Mass of rifle = 4 kg
(m2) Mass of bullet = 50 g = 0.05 kg
(v2) Velocity of bullet = 35 m/s
(v1) Recoil velocity of rifle = ?
According to the law of conservation of momentum
Momentum of rifle = momentum of bullet
2. A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint : 1 tonne = 1000 kg).
Ans. u = 0 m/s m = 7 tonnes
s = 400 m = 7 x 1000 kg
t = 20 s = 7000 kg
a = ?
F = ?
Answer:
In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. ... One can also speak of motion of images, shapes, and boundaries