Question

we, is done
OS
won
irection of torte
over ball vertically upwards. What type of wo
a) by the force applied by the boy ?
(o) by the gravitational force of earth?
Write the formula for work done on a body when the sun
the meaning of each symbol used.
28. How does the kinetic energy of a moving body depe
29. Give one example each in which a force does (~) posi
30. A ball of mass 200 g falls from a height of 5
ground ? (8 = 9.8 m/s-).
body when the body moves at an angle to the direct
moving body depend on its (1) speed, and (ii) mass?
a force does (a) positive work (1) negative work, and (c) ze
a height of 5 metres. What is its kinetic energy when it is
(c) zero work
it just tea
LOTTO
6 mis respect
fall at the e
is. If the mass
air resistance
hits the stoc
ches the ground ? (8 = 10 m/s)
od from 20 ml
20 Two objects having equal masses are moving "
Las 100 g. having a kinetic energy of 20).
Calculate the ratio of their kinetic energies.
masses are moving with uniform velocities of 2 m/s and 6 m/
33. A body of 2 kg falls from rest. What will be its
2 s? (Assume = 10 m/s-)
om rest. What will be its kinetic energy during the fall a
34. On a level road, a scooterist applies brakes to slow down
sneed of 10 m/s to 5 m/s. If the
scooterist and the scooter be 150 kg, calculate the wo
friction)
de 150 kg, calculate the work done by the brakes. (Neglect air
35. A man drops a 10 kg rock from the top of a
S rock from the top of a 5 m ladder. What is its speed just before it hits
What is its kinetic energy when it reaches the ground. 18
36. Calculate the work done by the brakes of a car of m
work done by the brakes of a car of mass 1000 kg when its speed is reduced fro
10 m/s ?

37. A body of mass 100 kg is lifted up by 10 m. Find :
(1) the amount of work done.
(11) potential energy of the body at that height (value of g = 10 m/s):
38. A boy weighing 50 kg climbs up a ve
weigung U kg climbs up a vertical height of 100 m. Calculate the amount of work done
much potential energy does he gain ? (g = 9.8 m/s).
39. When is the work done by a force on a body: (a) positive, (b) negative, and (c) Zero
40. To what height should a box of mass 150 kg be lifted, so that its potential energy may become 7350
(o= 0.8 m/s2).
initial velocity of 20 m/s. What
work done by him,​

Answer 1

Answer:

what is this.. .. .. . ur question is not clear

Answer 2

Answer:

A man drops a 10 kg rock from the top of a

S rock from the top of a 5 m ladder. What is its speed just before it hits

What is its kinetic energy when it reaches the ground. 18

Explanation: