An event recorder stores information about an emergency stop made by a forklift truck. When the operator notices an obstruction, the truck is moving at 5.0 m/s. The brakes begin to act after a delay. The truck has a mass of 2400 kg and travels a total distance of 13 m between the operator noticing the obstruction and the truck coming to rest.
The speed decreases at a constant rate while the brakes act.
| time after braking begins in s\mathrm{s}s | speed in m/s\mathrm{m/s}m/s |
|---|---|
| 0.0 | 5.0 |
| 4.0 | 0.0 |
What are the operator's reaction time and the magnitude of the resultant force on the truck while the brakes act?
0.60 s0.60\ \mathrm{s}0.60 s and 3000 N3000\ \mathrm{N}3000 N
2.6 s2.6\ \mathrm{s}2.6 s and 3000 N3000\ \mathrm{N}3000 N
2.6 s2.6\ \mathrm{s}2.6 s and 6000 N6000\ \mathrm{N}6000 N
0.60 s0.60\ \mathrm{s}0.60 s and 6000 N6000\ \mathrm{N}6000 N