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please help QUESTION 1 a) Estimate the volume of the earth in m3 by assuming that its radius is 6400 km. (4 marks) V =

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QUESTION 1 a) Estimate the volume of the earth in m3 by assuming that its radius is 6400 km. (4 marks) V = 4 TC R 3 b) A car accelerates from zero to 20 m/s in 5 s. i. ii. Calculate the acceleration of the car. If the acceleration is assumed to be constant, how far will the car travel in 15 s? iii. Calculate the speed of the car after 15 s. (8 marks) c ) A KTM commuter train travels between two stations, A and B. The train starts from rest from station A and accelerates at a constant rate for 0.5 km until it reaches a speed of 30 m/s. It then travels at this constant speed for T s before decelerating at a constant rate of 1.5 m/s? and coming to rest at station B. Figure 1 shows the velocity-time graph of the train's journey between the two stations. Determine the value of Tif the distance between the two stations 6 km. Calculate also the total time taken for the whole journey. Y(ms )4 30 Figure 1 (8 marks)

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