need help again thanks alot yahoo????

Question

An 868 kg (1918 lb) dragster, starting from rest, attains a speed of 26.9 m/s (60.3 mph) in 0.59 s.
(a) Find the average acceleration of the dragster during this time interval.
m/s2_____________
(b) What is the magnitude of the average net force on the dragster during this time?
N______
(c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert on the driver?
N__________

Answer 1

We'll use kinematics to solve these. Assume that accelerations are constant throughout.

For the first problem, acceleration = change in velocity / elapsed time.

a = (26.9 m/s) / (.59 s)

Solve for a. The force F is then equal to mass times acceleration

F = ma

The driver has the same acceleration as the dragster. The force on the driver is also equal to ma (but this time use the mass of the driver, not the dragster).