Motion in a Straight Line: Free Fall Advanced MCQ

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Free Fall AdvancedHardQuestion 5244

Question

A ball is thrown vertically upward with velocity 30 m/s from the top of a 45 m tower (g = 10 m/s²). The speed when it hits the ground is:

A
30√2 m/s
Correct
B
30 m/s
C
40 m/s
D
50 m/s

Correct answer

30√2 m/s

Explanation

By $v^2=u^2+2as$ , taking upward as positive gives $v^2=30^2+2(-10)(-45)=1800$ . Therefore the impact speed is $√1800=<strong>30√2\text{ m/s}</strong>$ .

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