Question

Il Slups suddenly.
f The gun recoils when a bullet is fired from it.
A moving truck takes a much longer time to stop than that taken by a car when brakes
are pressed at the same time.
h. When we jump on a concrete surface, the feet are more seriously hurt than while
jumping on sand,
i An athlete runs some distance before taking a long jump.
We beat a blanket with a stick to remove dust particles.
1.
Numericals Problems
(Assume g = 10m/s)
If a girl is running along a straight road with a uniform velocity 1.5 m/s, find her
acceleration.
(Ans: 0)
A car travelling at a velocity of 15 ms due north speeds up uniformly to a velocity of
30 ms' in 3 seconds. Calculate its acceleration.
(Ans: 5m/s2)
A bus is travelling at a speed of 60 km/hour. On seeing a boy 11 m ahead on the road,
the driver of the bus applies brakes and the bus stops at a distance of 10 m. What is its
retardation and how long does it take to come at rest? (Ans: 13.89 ms/2, 1.2 s)
A jeep starts from the state of rest. If its velocity becomes 60 km/hr in 5 minutes, (i)
What is the acceleration of the jeep? (ii) What is the distance covered by the jeep?
(Ans: 0.056 m/s, 2500 m)
car is moving with a velocity of 45 km/h. The driver presses the brakes and the
ar comes to rest in 3 seconds. What is its retardation? How far does it move before
oming to rest?
(Ans: 4.17 m/s, 18.74 m)
mn
M
Force
29​

Answer 1

Answer:

Explanation:

Because there is no external force on the gun-bullet system, it would conserve momentum. If the bullet gain momentum in one direction, the gun would gain momentum in the opposite direction.