Question

The height and width of each step of a staircase are 20cm and 30cm respecuvely. A ball roll.
of a star with horizontal velocity v and hits the fifth step. The magnitude of v is (g=10 m/S2)
1)1.5√5 m/s 2)3√5 m/s 3)7.5 m/s 4)1.5 m/s​

Answer 1

Answer:

R=u√2h/g

5×30=u√2×5×20/10

150=u√20

150=u2√5

75=u√5

75/√5=u

25×3/√5=u

√5×√5×5×3/√5=u

5×√5×3=u

15×0.1×√5=u

u=1.5√5