An engine of a car of power 80 kW moves on a ro... - JAMB Physics 2006 Question
An engine of a car of power 80 kW moves on a rough road with a velocity of 32 ms-1. The forces required to bring it to rest is
A
2.56 x 106N
B
2.50 x 106N
C
2.80 x 103N
D
2.50 x 103N
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Correct Option: D
In terms of dimension: power , P, = ML2T3
Force F1 = MLT-2; Vel, V, LT-1
From the above, => P = F x V
i.e, ML2T-3 = MLT-2 x LT-1
ML2T-3
=> 80,000 = F x 32
| ∴ F = | 80,000 |
| 32 |
= 2500N
= 2.50 x 103N
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