ACCELERATION QUESTIONS

Question

The first man jumps and his parachute does NOT open he accelerates at 10m/s/s for 4 secondS before the parachute opens how fast is he going just before the parachute opens? 

 

PLEASE SHOW ALL WORK 

Answer 1

 

We need to know how fast he was falling at the instant he pulled the cord.

That is initial velocity.

 

 

 acceleration =     final velocity - initial velocity

                           -------------------------------------

                                         time

 

10   =   ( final velocity - initial velocity)/4

 

40 = final velocity - initial velocity

 

40 + initial velocity = final velocity

 

When you find that number add it to 40 to get your answer.

We can also get the answer if we know how far he fell during the 4 seconds

between the time he pulled the cord to when the parachute opens.