Question
A(n) 840-kg dragster accelerates on a race track from rest to 85 km/h in 0.90 seconds.
(a) What is the change in momentum of the dragster?
(b) What is the average force exerted on the dragster?
(c) What exerts that force?
(a) What is the change in momentum of the dragster?
(b) What is the average force exerted on the dragster?
(c) What exerts that force?
Answers
(a) Multiply m by the change in V. Convert the final speed to m/s first.
(b) Average force = (momentum change)/time
(c) The track exerts the force against the tires.
(b) Average force = (momentum change)/time
(c) The track exerts the force against the tires.
a) If you did not know before, momentum is equal to mass times velocity, p=mv.
The others, "drwls", has explained it well enough for you.
The others, "drwls", has explained it well enough for you.