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A snowmobile has an initial velocity of 3.0 m/s

Part 1: If it accelerates at the rate of 0.5 m/s/s for 7.0 sec, what is the final vel.?
Part 2: If it accelerates at the rate of -0.60m/s/s, how long will it take to reach a complete stop?

Respuesta :

My answer to the problem is as follows:
 
1. Use the kinematic formula 

Vf = Vi + a*t 

for a, Vi = 3.0 m/s, a = 0.5 m/s/s, and t = 7.o s. 

for b, Vf = 0, Vi = 3.0 m/s, and a = -0.60 m/s/s. 

I hope my answer has come to your help. God bless and have a nice day ahead!

Answer:

Part a)

[tex]v_f = 6.5 m/s[/tex]

Part b)

[tex]t = 5 seconds[/tex]

Explanation:

Part a)

As we know that

[tex]v_f = v_i + at[/tex]

here we know that

[tex]v_i = 3 m/s[/tex]

[tex]a = 0.5 m/s^2[/tex]

[tex]t = 7.0 s[/tex]

so we will have

[tex]v_f = 3 + (0.5)(7.0)[/tex]

[tex]v_f = 6.5 m/s[/tex]

Part b)

if finally the snowmobile comes to rest

So here we can say that

[tex]v_f = 0[/tex]

[tex]v_i = 3.0 m/s[/tex]

[tex]a = -0.60 m/s^2[/tex]

so now we have

[tex]v_f = v_i + at[/tex]

[tex]0 = 3.0 - (0.60)t[/tex]

[tex]t = 5 s[/tex]