Forces and Laws...

Consider the following statements:
(a) No net force acts on a rain drop falling vertically with a constant speed.
(b) If net force acting on the body is zero, momentum of the body remains constant.
(c) Particle of different masses falls with different acceleration on earth.
(d) It is easier to start motion in a heavier body than a lighter body.
Which of the above statements are correct?

A bullet of mass $$10\ g$$ moving with the velocity of $$1.5\ ms^{-1}$$ hits a thick wooden plank of mass $$90\ g$$. The plank is initially at rest, but when it gets hit by the bullet, the bullet remains in the plank, and both move with a certain speed. Calculate the speed with which the plank containing the bullet moves?

When a net force acts on an object, the object will be accelerated in the direction of the force with an acceleration proportional to

A large truck and a car, both moving with a velocity of magnitude $$v$$, have a head-on collision. If the collision lasts for $$1\ s$$. Which vehicle experiences greater acceleration?

Suppose you push a spring with a force $$F_1$$ as shown in figure, the spring also pushes up on your hand with a force $$F_2$$. What is the relationship between $$F_1$$ and $$F_2$$?

A large truck and a car, both moving with a velocity of magnitude $$v$$, have a head-on collision. If the collision lasts for $$1\ s$$ which vehicle experiences greater force of impact?

Two small glass spheres of masses 10 g and 20 g are moving in a straight line in the same direction with velocities of $$3 ms^{-1}$$ and $$2 ms^{-1}$$ respectively. They collide with each other. After collision, glass sphere of mass 10 g moves with a velocity of $$2.5 ms^{-1}$$. Find the velocity of the second ball after collision.

The earth and the moon are attracted to each other by gravitational force. Is the force with which the Earth attracts the Moon greater, smaller or the same as the force with which the Moon attracts the Earth?

In which of the following cases the net force is not equal to zero?

Student A and student B sit in identical office chairs facing each other, as shown in figure. Student A is heavier than student B. Student A suddenly pushes with his feet. Which of the following occurs?