Question
1100 kg car accelerates from rest reaching distance of 139 m in 8.7 sec determine average power in KW your answer to 2 decimal places?
Answers
MathMate
1. find average acceleration, a
Vi=0
S=(1/2)at^2
139 m =(1/2)a(8.7²)
a=3.6729 m/s²
2. Find work done, W
a. using F=ma,
W = F*S = ma*S
where m=1100 kg, S=139 m, a=3.6729 m/s²
or
b. using energy (neglect loss)
final velocity, Vf = at
where t=8.7 s
final energy
=(1/2)m*Vf²
3. Find power = W/time in watts
1 KW = 1000 W.
Vi=0
S=(1/2)at^2
139 m =(1/2)a(8.7²)
a=3.6729 m/s²
2. Find work done, W
a. using F=ma,
W = F*S = ma*S
where m=1100 kg, S=139 m, a=3.6729 m/s²
or
b. using energy (neglect loss)
final velocity, Vf = at
where t=8.7 s
final energy
=(1/2)m*Vf²
3. Find power = W/time in watts
1 KW = 1000 W.