Question

B, August 2020
Topic : Force and laws of motion
Class : IX
1. Ifa net force of 7 N was constantly applied on 400 g object at rest, how long will it
take to raise its velocity to 80 m/s?
2. A driver accelerates his car first at the rate of 4 m/s2 and then at the rate of 8
m/s.Calculate the ration of the forces exerted by the engines?
3. A car start from rest and acquire a velocity of 54 km/h in 2 sec. Find
the acceleration
distance travelled by car assume motion of car is uniform
If the mass of the car is 1000 Kg. What is the force acting on it?
4. A bullet of mass 50g moving with an initial velocity of 100m's, strikes a wooden
blockand comes to rest after penetrating a distance 2cm in it. Calculate
() The initial momentum of the bullet
The final momentum of the bullet
Retardation caused by the wooden block
(iv) Resistive force applied by the wooden block
5. A man weighing 60kg runs along the rails with a velocity of 18 kmh and jumps into a
car of mass l quintal (100kg) standing on the rails. Calculate the velocity with which
car will start travelling along the rails.​

Answer 1

Answer:

Hey,I can't understand your question

Answer 2

The steps are as follows for first question