A scooter company gives the following specifications about its product.
Weight of the scooter — 95 kg
Maximum speed — 60 km/h
Maximum engine power — 3.5 hp
Pick up time to get the maximum speed — 5 s
Check the validity of these specifications.
Mass of the scooter, m = 95 kg
Maximum speed, v = 60 km/h = 50/3 m/s
Pick up time, t = 5 s
Engine power required to achieve this speed in given time = mv2/2t
= 2638.89 W
= 3.537 hp
This is a little higher than the given maximum power, i.e. 3.50 hp.
∴ An engine of 3.5 hp can not exactly produce 60 km/h speed in 5 s. Hence, these specifications are somewhat over claimed.