Question

(i) Kinetic energy
(b) The initial energy is transformed into heat energy when the pendulum bob strikes the air
molecules. Thus, the amplitude of pendulum decreases and finally it stops.
Numericals for Practice
1. How much work is done by a force of 10 N in moving an object through a distance of 4 m in the
direction of the force?
2. A car is being driven by a force of 2.5 * 101° N. Travelling at a constant speed of 5 m/s, it takes 2
minutes to reach a certain place. Calculate the work done.
3. How fast should a man of mass 50 kg run so that his kinetic energy is 6251?
4. A child pulls a toy car through a distance of 10 m on a smooth horizontal floor. The string held
in child's hand makes an angle of 60° with the horizontal. If force applied by the child is 16 N,
calculate the work done by the child in pulling the toy car.
16 NA
String​

Answer 1

Answer:

wat is this....where is the explanation

Answer 2

Answer:

Initial Velocity u=0

Fianl velocity v=?

Height, s=19.6m

By third equation of motion

v

2

=u

2

+2gs

v

2

=0+2×9.8×19.6

v

2

=384.16

⇒v=19.6m/s