Stapp rode a rocket sled, accelerating from rest to a top speed of 282 m/s (1015 km/h) in 5.00 s, and was brought jarringly back to rest in only 1.40 s! calculate his (a) acceleration and (b) deceleration. express each in multiples of g (9.80 m/s2) by taking its ratio to the acceleration of gravity.

a)

b)

Explanation:

Given that

Initial velocity u =0 m/s

Speed at 5 s v= 282 m/s

Rocket accelerated up to 5 s :

We know that

v= u + at

282= 0+ a x 5

So the acceleration

Rocket come to rest in 1.4 s :

Final velocity of rocket v=0 m/s

Initial velocity = 282 m/s

v= u + at

0= 282 - a x 1.4

So the deceleration

im guessing the west of station b

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.