Question

Siya throws a ball upwards, from a roof top, which is 20m above from ground. It will

reach a maximum height and then fall back to the ground. The height of the ball from

the ground at time t is h, which is given by 2 ht t = −+ + 4 16 20 . On the basis of above

information answer the following questions.













(i) Name the shape of the path followed by ball ?

(a) Linear (b) Spiral (c) Parabola (d) Circle

(ii) What is height reached by the ball after 1 second ?

(a) 64m (b) 128m (c) 32m (d) 20m

(iii) How long will the ball take to hit the ground ?

(a) 4 seconds (b) 3 seconds (c) 5 seconds (d) 6 seconds

(iv) What are the two possible times to reach the ball at the same height of 32 m ?

(a) 1 and 3 seconds (b) 1.5 and 2.5 seconds

(c) 0.5 and 2.5 seconds (d) 1.6 and 2.6 seconds

(v) What is the maximum height reached by ball ?

(a) 36m (b) 18m (c) 44m (d) 54​

Answer 1

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