- #1
Griffy11
- 27
- 0
Hi guys,
Calculate the change in kinetic energy of a car of mass 2000kg if it changes its velocity from 30km/h to 60km/h
KE=1/2mv^2
So, to find the change in KE, subtract its KE when it was going 30km/h from when it was going 60km/h.
At 30km/h:
KE=1/2mv^2
KE=1/2*200*8.33^2
KE=69389J
At 60km/h:
KE=1/2mv^2
KE=1/2*2000*16.7^2
KE=278890J
So change in KE is 209501-69389
= 209501J
Is that correct, or am I doing it totally wrong?
Also - "explain the source of the energy gain" - would that just be an increase in velocity?
Calculate the change in kinetic energy of a car of mass 2000kg if it changes its velocity from 30km/h to 60km/h
KE=1/2mv^2
So, to find the change in KE, subtract its KE when it was going 30km/h from when it was going 60km/h.
At 30km/h:
KE=1/2mv^2
KE=1/2*200*8.33^2
KE=69389J
At 60km/h:
KE=1/2mv^2
KE=1/2*2000*16.7^2
KE=278890J
So change in KE is 209501-69389
= 209501J
Is that correct, or am I doing it totally wrong?
Also - "explain the source of the energy gain" - would that just be an increase in velocity?