Verizon 12:36 PM session. masteringphysics.com C Problem 2.49 You\'re driving do

Question

Verizon 12:36 PM session. masteringphysics.com C Problem 2.49 You're driving down the highway late one night at 20 m/s when a deer steps onto the road 39 m in front of you. Your reaction time before stepping on the brakes is 0.50 s, and the maximum deceleration of your car is 10 m/s2 Part A How much distance is between you and the deer when you come to a stop? Express your answer to two significant figures and include the appropriate units Submit My Answers Give Up Correct Part B What is the maximum speed you could have and stll not hit the deer? Express your answer to two significant figures and include the appropriate units. 24 Submit My Answers G Up Incerrect: Try Again; 5 attempts remaining

Explanation / Answer

Q. 2.68)-

Part A)-

Lets assume that tina meets the david at distance S in time T from where she started then-

For David-

S = vT

S= 30(T) ...(1)

For Tina-

S = uT +1/2aT2 (where u =0, as per the question)

S = 0 +1/2(2.8)T2

S = 1.4T2 ...(2)

From eqn 1 & 2 -

1.4T2 - 30T =0

T(1.4T -30) = 0

T = 0 or T = 30/1.4 = 21.42 sec.

then-

S = 30T = 642.6m

Part B)-

V2 = U2 +2aS

V2 = 0 +2(2.80)(642.6)

V = 59.99 = 60m/s

Q 2.58)-

Part A)-

V2 = U2 +2aS (Where U=0, As per the question)

25 = 0 + 2(1)S

S = 12.5 m

Part B)-

S = uT +1/2aT2 (where u =0, as per the question)

200 = 0 +1/2(1)T2

T = 20 sec

Thank you !!! Have fun

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