1.A student is pushing a 30 kg desk across a floor at a
constant speed of 1 m/s. How
much work, tothe nearest whole joule, mustthe student do on the desk to change the speed to 6 m/s?

2. A 5 kg stone falls from the
top of a cliff and strikes the
ground at a speed of 88.5 m/s.
What is
the height of the cliff?

A student is pushing a = 35 kg desk across a floor at a constant speed of 1 = 4 m/s. How

much work, to the nearest whole joule, must the student do on the desk to change the speed to

2 = 6 m/s?

Solution:

Work done = change of energy

=

2

2

2

−

1

2

2

=

35 × 36

2

−

35 × 16

2

= 630 − 280 = 350 J

Answer = 350 J

pls give me brainlieste

none, its a machine

it is a negative acceleration