Ball A is thrown vertically downward from the top of a tower with a speed of

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Ball A is thrown vertically downward from the top of a

100\,\text{m}

tower with a speed of

10\,\text{m/s}

. One second later, ball B is projected vertically upward from the ground with a speed of

40\,\text{m/s}

. Neglect air resistance and take

g = 10\,\text{m/s}^2

. At what height above the ground do the two balls meet? (a)

35\,\text{m}

(b)

60\,\text{m}

(c)

47\,\text{m}

(d)

70\,\text{m}