Question

A body is projected at an angle of 60" with the
horizontal with kinetic energy E The potential energy
of body at highest point is
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CE​

Answer 1

Explanation:

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Answer 2

Answer:

KE at maximum height

2

1

mu

2

cos

2

60

0

=10J

2

1

mu

2

=40J

The above equation is the kinetic energy at the lowest point and hence the total energy of the particle.

At the highest point, total energy is:

mgh

max

+KE=40

mgh

max

+10=40

mgh

max

=30..............(1)

When PE=KE

PE=20=KE

⇒mgh=20............(2)

From (1) and (2),

h

max

h

=

3

2