Q64 of 139 Page 43

A car is travelling along the road at 8 m s-1. It accelerates at 1 m s-2. For a distance of 18 m. How fast is it then travelling?

U = 8 m s-1


a= 1 m s-2


d = 18 m


On using the formua we get


V = 10 m/s-1


More from this chapter

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61

Three speed-time graphs are given below :

Which graph represents the case of :


(i) a cricket ball thrown vertically upwards and returning to the hands of the thrower?


(ii) a trolley decelerating to a constant speed and then accelerating uniformly?

 62

Study the speed-time graph of a car given alongside and answer the following questions :

(i) What type of motion is represented by OA?


(ii) What type of motion is represented by AB?


(iii) Wht type of motion is represented by BC?


(iv) What is the acceleration of car from O to A?


(v) What is the acceleration of car A to B?


(vi) What is the retardation of car from B to C?

 63

What type of motion is represented by each one of the following graphs?

 65

A car is travelling at 20 m/s along a road. A child runs out into the road 50 m ahead and the car driver steps on the brake pedal. What must the car’s deceleration be if the car is to stop just before it reaches the child?