Question

a = 4m/s?
A body, moving with a certain initial velocity and acceleration of 4 ms, has a displacement
of 50 m in 10 s. The final velocity attained by it is
a) 15 ms -1
b) 25 ms
c) 20 ms?
d) 40 ms
​

Answer 1

Answer:

b) 20m/s

Explanation:

x=ut+0.5at^2

50=10u + 0.5 × 4 × 10×10

10u=50-200

10u=-150

u=-15m/s

v=u+at

v=-15+4×10

v=25m/s

Answer 2

Answer:

v2−42=2as                            v=u+at

(v−4)(v+4)=2(4)(50)       v=u+4(10)

40(v+4)=400                       v−4=40

v+4=10                                 v+4=10

                                               v−4=40

                                               2v=50

                                               v=25m/s