A toy car of mass 0.15kg accelerates from a speed of 10 cm/s to a speed of 15 cm/s. What is the impulse acting on the car?

A. 7.5 mN s
B. 37.5 mN s
C. 0.75 N s
D. 3.75 N s

If you could explain how you got it I would appreciate that

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Respuesta :

georgestirban georgestirban · Answer 1 · 2018-12-22T22:51:06+01:00

v=v2-v1=15-10=5 cm/s

p=mv=0.15•5=0.75 kg•cm/s

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Alleei Alleei · Answer 2 · 2020-01-06T06:01:59+01:00

Answer : The correct option is, (A) 7.5 mN.s

Explanation :

Impulse : It is defined as the force applied to an object for a certain amount of time.

Formula used :

[tex]I=F\times \Delta t[/tex]

As we know that:

[tex]F=m\times \Delta a\\\\\Delta a=\frac{\Delta v}{\Delta t}[/tex]

Thus, formula of impulse will be:

[tex]I=m\times \Delta v[/tex]

where,

I = impulse = ?

m = mass = 0.15 kg

[tex]\Delta v[/tex] = change in speed of velocity = [tex]v_{final}-v_{initial}=15cm/s-10cm/s=5cm/s=0.05m/s[/tex] (1 m = 100 cm)

Now put all the given values in the above formula, we get:

[tex]I=(0.15kg)\times (0.05m/s)[/tex]

[tex]I=0.0075kg.m/s=0.0075N.s=7.5mN.s[/tex] (1 N.s = 1000 mN.s)

Therefore, the impulse acting on the car is, 7.5 mN.s