How much work is done to increase a 20-kg scooter's speed from 10 m/s to 20 m/s
a. 1000j
b. 3000j
c. 4000j
d. 100j

3000 Joule of work is to be done.

Option: b

Explanation:

Given, mass of scooter = 20 Kg

Initial speed = 10 m/s,  Final speed = 20 m/s, Work done = ΔE

Where, ΔE= change in kinetic energy  

Solution:

=

Work done = ΔE = Kinetic Energy (final) - Kinetic Energy (initial)  

Work done = ΔE = 4000 J - 1000 J work done = ΔE = 3000J

as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper